SOLUTION: I drive 30 mph for quarter of an hour, and then 60 mph for 45 minutes. what is my average speed?

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Question 706409: I drive 30 mph for quarter of an hour, and then 60 mph for 45 minutes. what is my average speed?
Found 2 solutions by josgarithmetic, Simnepi:
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
The question is for distance and time.
Total distance = 30%2A%281%2F4%29%2B60%2A%283%2F4%29 miles.
Total time = %281%2F4%29%2B%283%2F4%29 hours.

Average speed = (Total Distance)/(Total Time) in miles per hour.
EDIT: Corrected mistake in use of datum.

Answer by Simnepi(216) About Me  (Show Source):
You can put this solution on YOUR website!
driving at 30 mph for quarter of an hour means you travel 7.5 miles 30%2F4
driving at 60 mph for three quarters of an hour means you travel 45 miles %2860%2F4%293
This gives a total distance of 52.5 miles travelled in 1 hour
so the average speed is
52.5 mph