Question
A man can row a boat at 8 km/h in still water. If the
speed of the water current is 2 km/h and it takes him 2 hours to row to a place and come back, how far off (in km) is the place?Solution
1. Let d be the distance to the place. 2. Speed downstream = 8 + 2 = 10 km/h and speed upstream = 8 − 2 = 6 km/h. 3. Total time for the trip is 2 hours. So, 
4. Solving for d: 
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