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


A. 48

B. 36

C. 50

D. 60


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

We get,

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.

Questions related to Boats and Stream are asked in Quantitative Aptitude section of various exams like SSC CGL, SSC MTS, SSC CPO, SSC CHSL, RRB JE, RRB NTPC, RRB GROUP D, RRB OFFICER SCALE-I, IBPS PO, IBPS SO, RRB Office Assistant, IBPS Clerk, RBI Assistant, IBPS RRB OFFICER SCALE 2&3, etc. Try and attempt free mock tests at PendulumEdu. Also, one can clear all exam related doubts through PendulumEdu’s one-to-one session.

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