Problema Solution
A boat was going upstream against a 5 mile per hour current. The boat trip took 10 minutes. On the return, it took 5 minutes. What is the speed of the boat in still water?
Answer provided by our tutors
Let speed of boat be x
and speed of stream = 5 mile per hour
Speed upstream = (x-5)
Speed down stream = (x+5)
Lets distance be y
Speed = distance / time
Distance = Speed * time
y = (x-5)* (10/60) [Upstream]
And y=(x+5)*(5/60) [down stream]
this implies
(x-5)/6 =(x+5)/12
x-5=(x+5)/2
2x-10=x+5
x=15
hence speed of boat = 15 miles per hour .