Question

A person travels to a hill if he goes from a to b with speed of 4km/h and return back with speed of 5km/h. What is his average speed

Answer 1

Explanation:

as we know

average speed=

total distance traveled/total time.

let he travels distance S from a to b

so we have total distance =2S

time to go from a to b =S/4

time to go from b to a= S/5

so we have total time =S/4 +S/5

that is =9S/20

now acc. to formula,

average speed =2S/{9S÷20}

=40/9km/hour.