Question

ritu can row downstream 20km in 2 hrs , and upstream 4km in 2hours. find her speed of of rowing in still water and the speed of current

Answer 1

let the speed of boat still in water be xkm/hr
speed of stream be ykm/hr
downstream = (x+y)
upstream = (x-y)
time 1 = 20/x-y
time2= 4/x+y
case 1 :
20/x-y + 4/x-y =2
then you can fine