SOLUTION: Car travelled 660 miles in 3hrs 40 mins. What was its avg speed?! How do I work this out as quick as possible without a calculator?! Thanks

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Question 623190: Car travelled 660 miles in 3hrs 40 mins. What was its avg speed?!
How do I work this out as quick as possible without a calculator?!
Thanks
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Car travelled 660 miles in 3hrs 40 mins. What was its avg speed?!
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3:40 = 220 minutes
r = d/t = 660/220 = 3 mi/min
= 180 mi/hr