Question

If the speed of boat in still water is 15km/h
more than speed of stream. If the boat travels a
distance of 37.8 km downstream in 1 hr 48mins.
Then what is the speed of the boat in still
water?​

Answer 1

D = 37.8

T = 1(48/60) = 9/5 h

S = 37.8*5/9 = 21km/h

now,

x+y = 21

x-y = 15

x= 18km/h