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Sticky Note
Ram can row downstream 20 km in 2 hours and upstream 4 km 2 hours. Find his speed of rowing in still water and speed of current.
  1. 6km/hr
  2. 4km/hr
  3. 3km/hr
  4. 7km/hr
  5. 8km/hour
Explanation

Downstream= x+y km/hr

And speed = distance/time

20km/2hr

10km/hr

Then x+y=10km/hr

or x = 10-y km/hr

Also

Downstream

x-y=4km/2hr

x-y=2km/hr

Putting value of x=10-y

10-y-y=2

y=4km/hr= speed of current

And x = 6km/hr= speed of boat

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