A boat travels upstream (against the current) between two points on a river 10 mi apart in 2.5 hours. The return trip downstream takes only 45 minutes. What is the boat's speed, and how fast does the current in the river flow?
(a) The speed of the boat is 4.5mi/h and the speed of the current flow is about 8.4 mi/h.
(b) The speed of the boat is 8.7 mi/h and the speed of the current flow is about 4.7 mi/h.
(c) The speed of the boat is 6.7 mi/h and the speed of the current flow is about 8.7 mi/h.
(d) The speed of the boat is 5 mi/h and the speed of the current flow is about 4 mi/h.
(e) The speed of the boat is 13.7 mi/h and the speed of the current flow is about 6.7 mi/h.
(b) The speed of the boat is 8.7 mi/h and the speed of the current flow is about 4.7 mi/h.
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