The speed of the boat in still water is 12 kmph. It takes 3 hours to cover 45 km downstream. What is the time taken by the boat to cover the same distance upstream?
(A) 4 hours
(B) 3 hours
(C) 5 hours
(D) 6 hours
I need explanation please
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Answer:
Speed of the boat in still water = 12 km/hr
Speed downstream
=
45
3
= 15 km/hr
Speed of the stream = 15-12 = 3 km/hr
Speed upstream = 12-3 = 9 km/hr
Time taken to cover 45 km upstream
=
45
9
= 5 hours.
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