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In the figure, a boat goes from ghat A to ghat B with the current. How long does the trip take?

Competition practiceBoats & Streams

A $5 \frac{1}{3}$ hours
B4 hours
C8 hours
D6 hours

Step-by-Step Solution

Downstream speed =

9 + 3 = 12

km/h. Time =

\frac{48}{12} = 4

hours. (Using 6 km/h upstream gives 8 h; using 9 km/h alone gives

5 \frac{1}{3}

h.)

Answer: B) 4 hours

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