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If a man rows @ 6kmph in still water & 4.5 km / hr against the current , then his speed along the current is ? |
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Answer» HEY! ! ! SOLUTION :- ☆ Let the place the man rows to be x and he rows back the same x distance. In still WATER he rows at 6 kmph. When the current is 1.2 kmph, he goes to that place rowing at 6+1.2 = 7.2 kmph, and when he rows back his speed is 6–1.2 = 4.8 kmph. The total time : x/7.2 + x/4.8 = 1, or 10x/72 + 10x/48 = 1, or 480x + 720x = 72*48, or 1200x = 72*48, or x = 72*48/1200 = 2.88 km. Check: Rowing downstream, time taken = 2.88/7.2 = 0.4 hour. Rowing UPSTREAM, time taken = 2.88/4.8 = 0.6 hour. Total time for rowing to and fro = 0.4+0.6 = 1 hour. Correct. The place is 2.88 km downstream. ☆ ☆ ☆ Hop its helpful ☆ ☆ ☆ ☆ Regards :- ♡♡《 IT'S ALL THE WAY RRJACK 29 》♡♡ |
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