Question

A boy walks at a speed of 9 km/h for 1 km and 6km/hr for next 2 km, Find the average speed of the boy for the walk of 3 km

Answer 1

Answer:

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Explanation:

Time taken for first km = 20/3

time taken for 2 km = 60 /6 × 2 = 20 min

average speed = 3+3 / 20+ 20

( here 20/3 is reciprocated)

6/40 = 3/20 km per min or 0.15 kilometer per min

Answer 2

Answer:

27/4 km/hr

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