A motorist travels to a place 150 km away at an average speed of 50 km/hr and returns at 30 km/hr. His average speed for the whole journey in km/hr is :
A) 35 B) 36 C) 37.5 D) 38.2
Answers
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Heya:)
Answer:
C.)37.5 km/h
Step-by-step explanation:
Time = Distance/Speed
Time taken in going = 150/50 km/h = 3 km/h
Time taken in returning = 150/30km/h = 5km/h
Total time = ( 3+5 ) h
Total distance = ( 150+150 ) km = 300 km
Average speed = Total Distance/Total time
= 300 km/ 8 h
= 37.5 km/h
hope it's helpful!!
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