A boat moves down the stream at the rate of 1 km in 6 minutes and up the stream at the rate of 1 km in 10 minutes. The speed of the current is


A) 2 km/hr

B) 1 km/hr

C) 1.5 km/hr

D) 2.5 km/hr

Correct Answer:
A) 2 km/hr

Description for Correct answer:

\( \Large v_{1} \) + \( \Large v_{2} \) = \( \Large \frac{1km}{6km}= 10 km/hr \) ....(i)

\( \Large v_{1} \) - \( \Large v_{2} \) = \( \Large \frac{1km}{10km} = 6 km/hr \) ...(ii)

Subtracting equation (ii) from (i), we get

\( \Large v_{2} = 2 km/hr \)


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