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A boat takes 3 min to travel 1 km downstream and 4 min to travel the samedistance upstream. The speed of the boat in still water and the speed of the waterare(1) 15 km/h; 5 km/h (2) 17.5 km/h , 5 km/h (3) 17.5 km/h , 2.5 km/h (4) 15 km/h; 2.5 km/h |
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Answer» Answer: I think it will help you Explanation: Correct option is C Let the speed of the motorboat be 36x km/hr and that of the current water be 5X km/hr. Speed DOWNSTREAM =(36x+5x) km/hr =41x km/hr Speed upstream =(36x−5x)=31x km/hr Time taken to downstream =5 hrs 10 min = 5 60 10 hrs = 6 31 hrs ∴ Distance covered downstream = (41x× 6 31 ) km ∴ Distance covered upstream = (41x× 6 31 ) km ∴ Time taken to travel upstream = (41x× 6 31 × 31x 1 )hrs= 6 41 hrs=6 6 5 hrs =6 hrs 50 min |
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