Question

Toni drives a boat 15 km/h upstream and then turns around and drives 25 km/h back downstream to herstarting point. If her total driving time is 4 hours, for how long does she drive upstream? Write and solve anequation to determine the answer.

Answer 1

total time = 4 hours

Upstream = 15 km/h

downstream = 25 km/h

The disatance is the same

speed = distance / time

solve for distance

distance = speed x time

total distance = distance upstream + distance downstrem

4(average speed) = 15(first time) + 25(second time)