A boat cover a distance from P to Q downstream and
return at original place upstream which flow at the rate
of 2.5 km/h. If the speed of boat in still water is 12.5 km/
h. Find average speed of journey.
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Answer:
Answer
Let distance be x km
Speed downstream = 5+2 = 7 km /hr.
Speed upstream = 5-2 = 3 km/hr.
So
3
x
−
7
x
=2
7x−3x=2×21
4x = 42
x=
4
42
=10.5 km/h
solution
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