QOTD- The speed of a boat in the upstream direction is 40 km/hr and that in the downstream direction is 60 km/hr. Find the time taken by boat (in minutes) to cover 50 km distance in still water?
2019-09-06 | Team PendulumEdu
Let X be the speed of a boat in still water and S be the speed of the water.
Then, according to the question
In downstream, Speed of a boat is 60 km/hr
Downstream speed = X + S = 60 …..(I)
In upstream, Speed of a boat is 40 km/hr
Upstream speed = X – S = 40 ……… (II)
By Solving (I) and (II) for X and S
X = 50 km/hr and S = 10 km/hr
Time taken by boat to cover 50 km distance in still water will be
Hence, (D) is the correct answer.
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