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a boatman rows 12 miles in 3 hours against the stream the rate of the stream is 5 milles per hour.how much time will be taken by the boatman if he rows 42 miles with the stream?
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- 3 hours
If speed of the boat=x, given speed of the stream=5 mph, then
12/(x-5)= 3 ,x=9 mph
Time taken to row 42 miles with the stream= 42/(x+5)= 42/(9+5)= 3 hours - 10 years agoHelpfull: Yes(4) No(1)
- 7 hours
If speed of the boat=x, given speed of the stream=5 mph, then
12/(5-x)= 3 ,x=1 mph
Time taken to row 42 miles with the stream= 42/(5+x)= 42/(5+1)= 7 hours - 10 years agoHelpfull: Yes(2) No(3)
- If speed of the boat=x, given speed of the stream=5 mph, then
12/(x-5)= 3 ,x=9 mph
Time taken to row 42 miles with the stream= 42/(x+5)= 42/(9+5)= 3 hours - 10 years agoHelpfull: Yes(2) No(0)
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