A man drives his car uniformly at 30 km/h for three hour. After it he covered next 90 km distance with uniform speed of 45 km/hr. Find the average speed of car.
Question
A man drives his car uniformly at 30 km/h for three hour. After it he covered next 90 km distance with uniform speed of 45 km/hr. Find the average speed of car.
Solution
To find the average speed of the car, we first need to find the total distance covered and the total time taken.
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For the first part of the journey, the man drives at 30 km/h for 3 hours. So, the distance covered is speed * time = 30 km/h * 3 h = 90 km.
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For the second part of the journey, the man covers 90 km at a speed of 45 km/h. So, the time taken is distance / speed = 90 km / 45 km/h = 2 hours.
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The total distance covered is 90 km (first part) + 90 km (second part) = 180 km.
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The total time taken is 3 hours (first part) + 2 hours (second part) = 5 hours.
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The average speed is total distance / total time = 180 km / 5 h = 36 km/h.
So, the average speed of the car is 36 km/h.
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