Quantitative Aptitude Ques 142

Question: A boat moves downstream at the rate of 1 km in $ 7\frac{1}{2}\min $ and upstream at the rate of 5 km an hour. What is the speed of the boat in the still water?

Options:

A) $ 3\frac{1}{2}km/h $

B) 8 km/h

C) $ 6\frac{1}{2}km/h $

D) 4 km/h

Show Answer

Answer:

Correct Answer: C

Solution:

  • Speed of downstream $ =\frac{60}{7.5}\times 1=8,km/h $ Speed of upstream = 5 km / h

$ \therefore $ Speed of boat in still water $ =\frac{8+5}{2}=\frac{13}{2}=6\frac{1}{2}km/h $

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