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in Distance, Time and Speed by (49.2k points)
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A boat moves downstream at the rate of 1 km in 6 min and upstream at the rate of 1 km in 10 min. The speed of the current (in km/hr) is 

(a) 1 

(b) 1.5 

(c) 2 

(d) 2.5

1 Answer

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by (46.2k points)
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Best answer

(c) 2 km/hr

Speed downstream = \(\big(\frac16\times60\big)\) = 10 km/hr 

Speed upstream = \(\big(\frac1{10}\times60\big)\) = 6 km/hr 

∴ Speed of the current = \(\frac12\) (10 – 6) km/hr = 2 km/hr.

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