# | | Question 16

Speed of motorboat in still water is 35 kmph. If the motorboat travels 100 km along the stream in 2 hour 30 min, then the time taken by it to cover the same distance against the stream is

**(A)** 2 hour 20 min

**(B)** 2 hour 40 min

**(C)** 3 hour 10 min

**(D)** 3 hour 20 min

**Answer:** **(D)** **Explanation:** The speed of the motorboat in still water is 35 km/hr.

let the speed of the strem = x km/hr

Downstream speed = Distance/time

= 100 / 2.5

= 40 km/hr

Speed of stream = 35 + x = 40

x = 5 km/hr

Upstream speed = 35 – 5 = 30 km/hr

Time taken in upstream = 100/30 =** 3 hour 20 min**

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