| 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 [SSC (10+2) 2012] |
A) Upstream in 4 h
B) upstream in 12 h
C) Downstream in 8 h
D) upstream in 6 h
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 \[=\frac{60}{5}=12h\] |
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