<PRE><B>Question 820200</B>
A cargo plane flew to the maintenance facility and back.
It took one hour less time to get there than it did to get back.
 The average speed on the trip there was 220 mph.
 The average speed on the way back was 200 mph.
 How many hours did the trip there take?
:
Let t = time to get there
then
(t+1) = time to get back
:
Write a distance equation: dist = speed * time
dist there = dist back
220t = 200(t+1)
220t = 200t + 200
220t - 200t = 200
20t = 200
t = 200/20
t = 10 hrs to get there
:
:
Check this by finding the distance each way, they should be equal if we did it right
220 * 10 = 2200 miles
200 * 11 = 2200 miles</PRE>