1.

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​

Answer»

Answer:

I think it will help you

Explanation:

Correct option is

C

6 hours 50 MIN

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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