A motorist has travels to a place 150 km away at an average speed of 50 km per hour and returns at 30 km per hour. His average speed for whole journey in km per hour is
Question
A motorist has travels to a place 150 km away at an average speed of 50 km per hour and returns at 30 km per hour. His average speed for whole journey in km per hour is
Solution
To calculate the average speed for the whole journey, we need to consider the total distance travelled and the total time taken.
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The total distance travelled is 150 km (to the place) + 150 km (return) = 300 km.
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The time taken to travel to the place is distance/speed = 150 km / 50 km per hour = 3 hours.
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The time taken to return is distance/speed = 150 km / 30 km per hour = 5 hours.
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So, the total time taken for the journey is 3 hours (to the place) + 5 hours (return) = 8 hours.
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Therefore, the average speed for the whole journey is total distance / total time = 300 km / 8 hours = 37.5 km per hour.
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