uestion 1: P and Q are two towns. Ravi covers the distance from P to Q on cycle at 16 km/hr. However, he covers the distance from Q to P on foot at 9 km/hr. His average speed during the whole journey is:
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p__________________q
16km
_________________
9km/h
Let the total jounery distance =5 km
Ravi cover p to q 16 km
s/2/10=s/32
Ravi cover 1/2 jounery from q to pwith speed and take a time
t²=s/2/9=s/2*5=s/18
average speed of Ravi =total distance/total time taken
s/t¹+t²=s/3/32+s/16=s/45+8/144
=144s/125s
11.52 km
hope it's help
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