35. A boy walks to his school at a distance of 6 km
with constant of 2.5 km/h and walks back with a
constant speed of 4 km/h. What is average spend
for the round trip in (km/h)?
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Answer:
Time for forward journey t
1
=
2.5
6
=
5
12
=2.4 hr
Time for backward journey t
2
=
4
6
= 1.5 hr
Average speed =
2.4+1.5
6+6
=
3.9
12
=
13
40
km/hr
Explanation:
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