Calculating car speed by telephone poles?

If a car is going 55 miles per hour on a road that has telephone poles along it that are 100 feet apart, how often ( in seconds ) will the car pass a pole? How about if the car speed is 60mph?|||[6]


55 mph=55x5280/60x60 ft /sec


=80.66 ft/sec


Time taken to pass a pole=time taken to travel 100 ft


=100/80.66 sec


=1.2397 or 1.24 sec


If the speed is 60 mph,the time taken would be


1.24x55/60=1.1366 sec or 1.14 sec