a person can swim in still water at speed 5 m/s . how much time will he take to move a distance of 120 m in upstream of water flowing at 1 m/s upstream and downstream respectively/
Going upstream means going against the water. Now the velocity of the swimmer with respect to the bank of the river will be 5-1=4 m/s. So the time taken to cross 120 distance will be .
And while going downstream the velocity of swimmer with respect to bank is 5+1=6 m/s hence time taken is .
And while going downstream the velocity of swimmer with respect to bank is 5+1=6 m/s hence time taken is .