Question
George’s plane climbs 450 feet in 40 seconds. Jenny’s plane climbs 320 feet in 30 seconds. The unit rate per second of the fastest plane is ____________.
- 12.8
- 14.2
- 11.25
- 10.6
The correct answer is: 11.25
In this question we were given that George's plane climbs 450 feet in 40 sec and Jenny's plane climbs 320 feet in 30 sec and we were asked to find the fastes plane per unit second
George's plane = 450 feet in 40 sec
Jenny's plane = 320 feet in 30 sec
George's plane in 1 second= 450/40=11.25 feet
Jenny's plane in 1 second=320/30=10.67 feet
By comparing botj unit second spped we can observe George's plane is fast and speed is 11.25 feet/sec
In this question we found unit speed of each plane per second and then compared them to obtain the largest unit speed per second.
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