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speed in still water X= 7.5 and speed of current y= 1.5
Step-by-step explanation:
downstream X+Y= 36 km / 4 hours = 9kmph
upstream X-Y=30 km/5 hours = 6kmph
x+y=9 ....eq1
x-y = 6 .....eq2
by adding 1 and 2
2x= 15
X= 15/2 = 7.5
X+y= 9
7.5+y= 9
y = 9-7.5 = 1.5
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