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On Benz Circle three consecutive traffic lights change after 35,42,70 seconds respectively. If the lights are switched on at 2:00 P.M. sharp at what time will they change simultaneously?

Question

On Benz Circle three consecutive traffic lights change after 35,42,70 seconds respectively. If the lights are switched on at 2:00 P.M. sharp at what time will they change simultaneously?

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Solution 1

Para resolver este problema, necesitamos encontrar el mínimo común múltiplo (MCM) de los tiempos de cambio de los semáforos, que son 35, 42 y 70 segundos. El MCM nos dará el tiempo en segundos después del cual todos los semáforos cambiarán simultáneamente.

  1. Descomposición en factores primos:

    • 35 = 5 × 7
    • 42 = 2 × 3 × 7
    • 70 = 2 × 5 × 7
  2. Identificar los factores primos comunes y no comunes con su mayor exponente:

    • 2 (máximo exponente: 1)
    • 3 (máximo exponente: 1)
    • 5 (máximo exponente: 1)
    • 7

This problem has been solved

Solution 2

Para resolver esta pregunta, necesitamos encontrar el mínimo común múltiplo (MCM) de los tiempos de cambio de los semáforos, que son 35, 42 y 70 segundos. El MCM nos dará el tiempo en segundos después del cual todos los semáforos cambiarán simultáneamente.

  1. Descomposición en factores primos:

    • 35 = 5 × 7
    • 42 = 2 × 3 × 7
    • 70 = 2 × 5 × 7
  2. Identificar los factores primos comunes y no comunes con su mayor exponente:

    • 2 (máximo exponente: 1)
    • 3 (máximo exponente: 1)
    • 5 (máximo exponente: 1)
    • 7 (máximo exponente: 1)
  3. Calcular el MCM:

    • MCM = 2^1 × 3^1 × 5^1 × 7^1
    • MCM = 2 × 3 × 5 × 7
    • MCM = 210 segundos
  4. Convertir 210 segundos a minutos y segundos:

    • 210 segundos = 3 minutos y 30 segundos
  5. Determinar la hora exacta:

    • Si los semáforos se encienden a las 2:00 P.M., sumamos 3 minutos y 30 segundos.
    • 2:00 P.M. + 3 minutos y 30 segundos = 2:03:30 P.M.

Por lo tanto, los semáforos cambiarán simultáneamente a las 2:03:30 P.M.

This problem has been solved

Solution 3

Para resolver este problema, necesitamos encontrar el mínimo común múltiplo (MCM) de los tiempos en los que cambian las luces del semáforo: 35, 42 y 70 segundos. El MCM es el menor número que es múltiplo de todos estos números.

  1. Descomposición en factores primos:

    • 35 = 5 × 7
    • 42 = 2 × 3 × 7
    • 70 = 2 × 5 × 7
  2. Identificar los factores primos comunes y no comunes con su mayor exponente:

    • 2 (máximo exponente: 1)
    • 3 (máximo exponente: 1)
    • 5 (máximo exponente: 1)
    • 7 (máximo exponente: 1)
  3. Calcular el MCM:

    • MCM = 2^1 × 3^1 × 5^1 × 7^1
    • MCM = 2 × 3 × 5 × 7
    • MCM = 210

El MCM de 35, 42 y 70 es 210 segundos.

  1. Convertir 210 segundos a minutos:
    • 210 segundos = 210 / 60 minutos
    • 210 segundos = 3 minutos y 30 segundos

Por lo tanto, las luces cambiarán simultáneamente cada 3 minutos y 30 segundos.

  1. Calcular el tiempo exacto:
    • Si las luces se encienden a las 2:00 P.M., sumamos 3 minutos y 30 segundos.
    • 2:00 P.M. + 3 minutos y 30 segundos = 2:03:30 P.M.

Entonces, las luces cambiarán simultáneamente a las 2:03:30 P.M.

This problem has been solved

Solution 4

To find out when the three traffic lights will change simultaneously, we need to find the least common multiple (LCM) of the three time intervals (35, 42, and 70 seconds).

Step 1: Prime factorize the three numbers.

  • 35 = 5 * 7
  • 42 = 2 * 3 * 7
  • 70 = 2 * 5 * 7

Step 2: Find the LCM. The LCM is found by multiplying the highest power of all the prime numbers in any of the three numbers.

  • LCM = 2 * 3 * 5 * 7 = 210 seconds

So, the three lights will change simultaneously every 210 seconds, or 3.5 minutes.

Step 3: Find out when they will change simultaneously. The lights were switched on at 2:00 P.M. sharp. So, they will change simultaneously at 2:00 P.M. plus the LCM.

Therefore, the three traffic lights will change simultaneously at 2:03.5 P.M.

This problem has been solved

Solution 5

To determine the time at which the three traffic lights will change simultaneously, we need to find the least common multiple (LCM) of their cycle times: 35 seconds, 42 seconds, and 70 seconds.

Step 1: Find the prime factorization of each number.

  • 35 = 5 × 7
  • 42 = 2 × 3 × 7
  • 70 = 2 × 5 × 7

Step 2: Identify the highest power of each prime number that appears in the factorizations.

  • The highest power of 2 is 2^1.
  • The highest power of 3 is 3^1.
  • The highest power of 5 is 5^1.
  • The highest power of 7 is 7^1.

Step 3: Calculate the LCM by multiplying these highest powers together.

  • LCM = 2^1 × 3^1 × 5^1 × 7^1
  • LCM = 2 × 3 × 5 × 7
  • LCM = 210

Step 4: Convert the LCM from seconds to minutes and seconds.

  • 210 seconds = 3 minutes and 30 seconds

Step 5: Add this duration to the initial time of 2:00 P.M.

  • 2:00 P.M. + 3 minutes and 30 seconds = 2:03:30 P.M.

Therefore, the three traffic lights will change simultaneously at 2:03:30 P.M.

This problem has been solved

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