lydia rode 243 miles in a three day bike tripon the first da

lydia rode 243 miles in a three day bike trip.on the first day , lydia rode 67 miles. on the second day, she rode 92 miles. how many miles per hour did she average on the third day if she rode for 7 hours?

Solution

On the 3rd day she rode 243-(67+92) = 84 miles
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Her rate on the 3rd dat was 84/7 = 12 mph