Problema Solution
John 's boat travels at speed of 20km/hr in still water.. He covers 90km against current... Then covers same distance with current.. Total time 9 hr 36 min find speed of current.
Answer provided by our tutors
The speed of current is x
The equation is
90/(20-x) +90/(20+x) = 9.6
So
x = 5
So the speed of current is 5 km/h