Problema Solution
A car is traveling at 47 miles per hour when the driver presses the brake pedal. From that moment on the cars speed decreases by 4 miles per hour every second. How long after the brake pedal has been pressed is the car slowed to a speed of 7.4 miles per hour?
Answer provided by our tutors
let 'x' represent the number of seconds after the car slowed to a speed of 7.4
47 - 4x = 7.4
by solving we find:
x = 9.9 sec
click here to see the step by step solution of the equation:
after 9.9 seconds the car slowed to a speed of 7.4 mph.