A boat covers 20 km in 4 hours along the current and 9 km in 3 hours against the current. What is the speed of the current ?

A) 2 kmph

B) 1 kmph

C) 1.5 kmph

D) 1.75 kmph

Correct answer:
B) 1 kmph

Description for Correct answer:
Rate downstream

= \( \Large \frac{20}{4} = 5 kmph \)

Rate upstream

\( \Large \frac{9}{3} = 3 kmph \)

\( \Large \therefore \) Speed of current

= \( \Large \frac{1}{2} (5 - 3) = 1 kmph \)

Please provide the error details in above question

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