SOLUTION: 24. Patrick drove 3 hr to attend a meeting. On the return trip, his speed was 10 mph less and the trip took 4 hr. What was his speed each way?

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Question 871075: 24. Patrick drove 3 hr to attend a meeting. On the return trip, his speed was 10 mph less and the trip took 4 hr. What was his speed each way?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
let speed to go be x
so distance traveled = 3x
returning speed = (x-10)
time = 4 hours
distance = 4(x-10)
distance is same
3x=4(x-10)
3x=4x-40
4x-3x=40
x= 40 mph
returning speed = 30 mph