A boat against the current of water goes 9 km/hr and in the direction of the current 12 km/hr. The boat takes 4 hours and 12 minutes to move upwared and downward direction from A to B. What is the distance between A and B?

A) 21.6 km

B) 21.0 km

C) 22 km

D) 30 km

Correct answer:
A) 21.6 km

Description for Correct answer:

\( \Large \frac{d}{9}+\frac{d}{12}=4\frac{12}{60} \)

Therefore, d = 21.6 km


Please provide the error details in above question

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