Question
A river flows at 3km/h. At what speed must a boat travel in order to make a 35km trip upstream in a time of 50 minutes?
How long will it take the boat to make the return trip downstream? (Assume the boat retains the speed travelled upstream)
Working out please
How long will it take the boat to make the return trip downstream? (Assume the boat retains the speed travelled upstream)
Working out please
Answers
u = boat speed
u-3 = upstream speed
u+3 = downstream speed
distance = speed * time
35 = (u-3) * 5/6
210 = 5u - 15
225 = 5u
45 = u
downstream,
35 = 48 * t
t = 35/48
t = 0.729 hr = 43min 45 sec
u-3 = upstream speed
u+3 = downstream speed
distance = speed * time
35 = (u-3) * 5/6
210 = 5u - 15
225 = 5u
45 = u
downstream,
35 = 48 * t
t = 35/48
t = 0.729 hr = 43min 45 sec
BAD QUESTION
Related Questions
A boat propelled so as to travel with a speed of 0.50m/s in still water, moves directly (in a straig...
The current river flows at rate of 4mph. In order for a boat to travel 24 miles up river and then re...
A boat, propelled so as to travel with a speed of 0.5m/s in still water, moves across a river that i...