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The stream's speed is one-fourth of a boat's still-water speed. The boat goes 30 km downstream in 2 hours. How long will 36 km upstream take?

Competition practiceBoats & Streams

A3 hours
B2.4 hours
C6 hours
D4 hours

Step-by-Step Solution

Downstream = 15 km/

h = B + \frac{B}{4} = \frac{5 B}{4} \Rightarrow B = 12

, stream = 3. Upstream = 9 km/

h

. Time =

\frac{36}{9} = 4 h

.

Answer: D) 4 hours

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