A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?

**Answer: **B

Rate downstream = 16/2 kmph = 8 kmph.

Rate upstream = 16/4 kmph = 4 kmph.

Speed in still water = 1/2 (8 + 4) kmph = 6 kmph.

In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:

**Answer: **C

Speed in still water = 1/2(11 + 5) kmph = 8 kmph.

A motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is:

**Answer: **B

No answer description available for this question.

A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively?

**Answer: **C

No answer description available for this question.

A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is:

**Answer: **C

Man's rate in still water = (15 - 2.5) km/hr = 12.5 km/hr.

Man's rate against the current = (12.5 - 2.5) km/hr = 10 km/hr

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