the average speed of a car decreased by 3 miles per hour every successive 8 - minutes interval . if the car traveled 3.6 miles in the sixth 8 - minute interval , what was the average speed of the car , in miles per hour , in the first 8 minute interval ?
"( 3.6 miles / 8 minutes ) * 60 minutes / hour = 27 mph let x be the original speed . x - 5 ( 3 ) = 27 x = 42 mph the answer is d ."
add(add(add(add(divide(3.6, divide(8, const_60)), 3), 3), 3), 3)