The speed of a boat in still water is 15 km/hr. It can go 30 km upstream and return downstream to the original point in 4 hrs 30 min. The speed of the stream is:

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The speed of a boat in still water is 15 km/hr. It can go 30 km upstream and return downstream to the original point in 4 hrs 30 min. The speed of the stream is:

A12 km/hr

B8 km/hr

C5 km/hr

D10 km/hr

Answer:

C. 5 km/hr

Read Explanation:

Explanation:

D $=t [\frac{(u2-v2)}{2u}] 30$

$= (4\frac{1}{2})\times{[\frac{(152-v2)}{2\times{15}}]}$

$= \frac{9}{2}[\frac{(225-v2)}{30}]$

200=225- v2

v2=25

v=5km/hr.

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