Problema Solution
the river boat delta duchess paddled upstream at 12 km/h, stopped for 2 h of sightseeing, and pulled back at 18km/h. how far upstream did the boat travel if the total time for the trip, including the stop, was 7h?
Answer provided by our tutors
Let D be the distance covered in one direction, from the formula:
Speed = distance/ time
we have, time = Distance/speed
Hence we get,
D/12 + 2 + D/18 = 7
Multiply by 36
3D + 72 + 2D = 252
5D = 180
D = 180/5 = 36 km