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A boat goes at 14 kmph along the stream and 8 kmph against the stream. The speed of the boat (in kmph) in still water is :

A12 kmph

B11 kmph

C10 kmph

D8 kmph

Answer:

B. 11 kmph

Read Explanation:

Solution:

Given:

Rate of Downstream = 14 kmph

Rate of Upstream = 8kmph

Calculation:

Speed of boat in still water = 12\frac{1}{2} (rate downstream + rate upstream)

=12(14+8)=222=11kmph=\frac{1}{2}(14+8)=\frac{22}{2}=11kmph

Speed of Boat in Still Water is 11kmph.


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Speed of a speed-boat when moving in the direction parallel to the direction of the current is 16 km/hr. Speed of the current is 3 km/hr. So the speed of the boat against the current will be (in km/hr)