Quantitative Aptitude Ques 223

Question: A boatman goes 2 km against the current of the stream in 1 h and goes 1 km along the current in 10 min. How long will it take to go 5 km in stationary water?

Options:

A) 80 min

B) 75 min

C) 70 min

D) 72 min

E) 84 min

Show Answer

Answer:

Correct Answer: B

Solution:

  • Upstream speed = 2 km/h Downstream speed $ =\frac{1}{10}=6,km/h $

$ \therefore $ Speed in still water $ =\frac{2+6}{2}=4,km/h $ Time required to go 5 km in still water $ =\frac{5}{4}h=1,h,15,\min =75\min $

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