A family is on a road trip. The speed limit during the first 115 miles of the trip is 55 mph, and the speed limit during the last 165 miles is 70 mph. How many miles per hour over the speed limits must they drive in order to arrive at their destination in 4 hours?
+15001 A family is on a road trip. The speed limit during the first 115 miles of the trip is 55 mph, and the speed limit during the last 165 miles is 70 mph. How many miles per hour over the speed limits must they drive in order to arrive at their destination in 4 hours?
Hello Guest!
\(\large \frac{115}{55+x}+\frac{165}{70+x}=4\)
\(x=6.9601\)
6.96 miles per hour over the speed limits must they drive in order to arrive at their destination in 4 hours.
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