16x = 2250 + 6x
x = 225
So he must sell 225 cameras
16(275) = 4400
6(275) = 1650
4400 - (1650 + 2250) = 500
$500 profit
This is a bit confusing, double check if you typed everything correctly.
15 mph 5280 ft 1 hr
----------- * ------------- * ------------ = 1320 feet per min.
1 1 mile 60 min
You might want to make use of the fact that 60 mph = 88 ft/sec.
