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

3.6 km
2.4 km
1.2 km
1.8 km

Correct Answer: 3.6 km

Explanation:

Downstream speed = 15 + 3 = 18 km/hr.
Required distance = (18 x 12)/60 = 3.6 km

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