A houseboat in the Kerala backwaters has a still-water speed of 30 km/h. It goes 40 km downstream and returns, taking 3 hours in all. What is the speed of the current?
Competition practiceBoats & Streams
A5 km/h
B15 km/h
C8 km/h
D10 km/h
Step-by-Step Solution
30+s40+30−s40=3. With s=10:4040+2040=1+2=3 ✓.(s=5 gives about 2.74 h.)
Answer: D) 10 km/h
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