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If ellen and sue leave school for the library at 3pm.
Ellen is going 12 miles per hour n sue is going 9 miles an hour.
Ellen gets there 15 mins before sue.
What time does ellen get there.
How far is the library
Change 15 min to .25 hr
Let d = distance to the library
Write a time equation; time = dist/speed
Sue's time - Ellen's time = 15 min
Multiply both sides by 36, results:
4d - 3d = .25(36)
d = 9 mi is the distance to the library
Find Ellen's time to get to the library
hr which is 45 min
3:00 + :45 = 3:45 time when Ellen get's there