Quantitative Aptitude Ques 1024

Question: A boy can swim in still water at a speed of 10 km/h. If the speed of the current would have been 5 km/h, then the boy would swim 60 km

Options:

A) Upstream in 4 h

B) upstream in 12 h

C) Downstream in 8 h

D) upstream in 6 h

Show Answer

Answer:

Correct Answer: B

Solution:

  • Rate downstream $ =10+5=15km/h $ Rate upstream $ =10-5=5km/h $ Time taken in swimming 60 km downstream $ =\frac{60}{15}=4h $ Time taken in swimming 60 km upstream $ =\frac{60}{5}=12h $