RRB NTPC 18 January 2017 Paper

Question : 110 of 120

Marks: +1, -0

Speed of a boat in still water is 12 kmph and that of the current is 3 kmph. A man rows a boat upstream up to 135 km and returns downstream to the starting point. Find the total time taken for the entire journey in hours.

Validate

Solution:

speed of current = 3 km/h
Speed upstream = 12 – 3 = 9 km/h
Speed downstream = 12 + 3
= 15 km/h
Total time taken =

135/9

135/15

= 15 + 9
= 24 hours

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