Question

20
The speed of boat upstream and speed
of boat downstream are 7 km/h and 13
km/h, respectively. Then the speed of
stream and the speed of boat in still
water is?​

Answer 1

Answer:

Rate in still water=[(1/2)(u+v)] km/h

Rate of current=[(1/2)(u-v)] km/h

where u= speed of boat in downstream

v=speed of boat in upstream

Speed of boat in still water=[(1/2)(7+13)] =10 km/h

Speed of the stream =[(1/2)(13-7)]=3 km/h