Problema Solution
A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
Answer provided by our tutors
Let
v = 13 km/h the speed of the boat in still water
s = 4 km/hr the speed of the stream
d = 68 km the distance the boat travels downstream
t = the time the boat needs to go 68 km downstream
The speed of the boat downstream is: v + s = 13 + 4 = 17 km/h
Since speed = distance/time follows time = distance/speed:
t = 68/17
t = 4 hr
The time that the boat needs to go 68 km downstream is 4 hours.