A tug boat that is capable of moving at 10 km/h relative to the water must make a round trip to a town 20 km upstream. If the river is flowing at 2 km/h, how long does the entire trip take?

1 Answer
Harish Chandra Rajpoot
Jul 25, 2018

#4\ \text{hrs#

Explanation:

The total time taken by tug boat moving with a relative speed of #v=10\ \text{km/hrs# traveling a total distance # d=2\cdot 20=40\ km#

#d/v#

#=\frac{40}{10}#

#=4#

The boat will take #4\ hrs# to complete the round trip

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