A boat cover a distance of 30 km downstream in 2 h while

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A boat cover a distance of 30 km downstream in 2 h while it takes 6 h to cover the same distance distance upstream. What is the speed of the boat (in km/h) ?

1. 5
2. 7.5
3. 13
4. 10

Correct Option: D

Speed of boat downstream = Distance covered / Time taken
= 30/2 = 15 km/h

Now, speed of boat upstream = Distance covered / Time taken
= 30/6 = 5 km/h

Now, speed of boat = (Speed download + Speed upstream) / 2
= (15 + 5) / 2 = 10 km/h