Answer the question asked. When necessary, round to the nearest hundredth.A barge takes 4 hours to move (at a constant rate) downstream for 40 miles, helped by a current of 3 miles per hour. If the barge's engines are set at the same pace, find the time of its return trip against the current.
A. 4 hr
B. 7 hr
C. 80 hr
D. 10 hr
Answer: D
Mathematics
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Mathematics