# Abdyl while runing to school ,computers the average speed for his trip to be 20 kmh-1 on his return trip along the same route there is less traffic and the average speed is 30kmh-1 what is the averge speed for abdul trip

2
by 1jasminjasmin

## Answers

2014-10-31T12:02:17+05:30

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Let distance between home to school = x km
average speed while going = 20 km/h
time taken (t₁) = (x/20) h
average speed while returning = 30 km/h
time taken (t₂) = (x/30) h
total distance = x+x = 2x
total time = (x/20) + (x/30) = x(1/20 + 1/30) = x[(3+2)/60] = x(5/60) = x/12 h

Average speed = total distance/ total time taken
=2x/(x/12)
=(2x/x)×12
= 24 km/h
2014-10-31T15:07:14+05:30

### This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
So let the distance to school be x
so time taken to go school = x/20 hr
and time taken to return home = x/30

total time = x/20 + x/30 = x/12
so total distance = x + x = 2x

so average speed = 2x / x/12 = 2 x 12 = 24 km/h