1.

A boat takes two hours to travel 8 km down and 8 km up the river when the water is still how much time will the boat take to make the same trip when the river starts flowing at 4 km/h?

Answer»

,● VELOCITY of boat in still water = 8km/hr● Velocity of boat w.r.t river =8km/hr =V1● Velocity of river w.r.t. ground = V2 = 4km/hrTime taken by boat to go 1 km upstream is 1 hr and 1 km DOWNSTREAM is 1 hrNow,Velocity in upstream direction = (8-4)=4kmphvelocity in downstream direction =(8+4)=12kmphTo travrl 8km upstream time taken = 8/4 =2hrTo TRAVEL 8km downstream time taken = 8/12 = 2/3hr = 2/3*60= 40min→ Tota time taken = 2hr 40 minhappy to HELP !!:)



Discussion

No Comment Found

Related InterviewSolutions