a motorboat goes downstream in a river and covers the distance between two coastal towns in five hours. It covers this distance upstream in six hours. If the speed of water is 4 km/h. Find the distance between the two towns.
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Step-by-step explanation:
speed of motor boat in still water =x
speed of stream=y
speed of the boat in down stream = X+y=X+4
time taken in down stream=5 hours
d= t*s=(x+4) *5------>I
speed of the boat in up stream = X-y=X- 4
time taken in up stream=6 hours
d= t*s=(x-4) *6------->II
from II and II
(x+4) *5=(x-4) *6
5X+20=6X-24
6X-5X=20+24
X=44
Distance =(44+4)*5=240 km
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