If downstream speed of a boat is 16 kmph and its upstream speed is 11 kmph, what is the speed of stream ‘?
Let speed of boat in stream water be 'v' kmph.
Let speed of stream be 'u' kmph.
Speed of boat while going downstream=v+u kmph.
Speed of boat while going upstream=v-u kmph.
According to question,
v+u=16. eq(1)
v-u=11. eq(2)
Solving above two equations,
v = 13.5 kmph, u = 2.5 kmph.
Hence, Option D is correct.
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