Mathematics · Boats and Streams
A motorboat whose speed is 15 km/hr in still water goes 30 km downstream and comes back to the starting point in a total of 4 hours 30 minutes. The speed of the stream is:
- 110 km/hr
- 27 km/hr
- 35 km/hr✓
- 43 km/hr
Correct answer
5 km/hr
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