The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:

1.2

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1.8

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3.6

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Solution

The correct option is B $3.6$ km
The speed of a boat in still water $= 15 k m / h r$
Rate of current $= 3 k m / h r$
Speed in downstream $= 15 + 3 = 18 k m / h r$
Time given $= 12 m i n = \frac{12}{60} h r = \frac{1}{5} h r$
Distance travelled $= S p e e d \times T i m e = 18 \times \frac{1}{5} = 3.6 k m$
Hence the correct option is (D).

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The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:

The correct option is B 3.6 kmThe speed of a boat in still water=15km/hrRate of current =3km/hrSpeed in downstream=15+3=18km/hrTime given=12min=1260hr=15hrDistance travelled=Speed×Time=18×15=3.6kmHence the correct option is (D).