An algebra problem by Matthew Eyre
Algebra
Level
2
A remote control car is driving at a speed of 2.5 inches per second. What is its speed in mph?
0.142mph
0.147mph
0.178mph
0.028mph
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1 solution
An hour has 3,600 seconds and a mile has 5,280 × 12 inches = 63,360 inches, so 2½ inches per second is: 2.5 × 3,600 / 63,360 = 0.142 mph