Question

An automobile driver uses a turn signal for the last 100 feet before a turn, traveling an average of 20 miles per hour during this time. Which expression can be used to calculate the amount of time, in seconds, the driver uses the turn signal for this turn?

a) (100/20) × 3600
b) 100/20
c) (100/20)×60
d) 100/20

Answer 1

The amount of time the driver uses the turn signal can be calculated by dividing the distance traveled by the average speed.

Step-by-step explanation:

The amount of time the driver uses the turn signal can be calculated by dividing the distance traveled by the average speed. In this case, the distance is 100 feet and the average speed is 20 miles per hour. To convert the distance to meters, we multiply by a conversion factor of 0.3048 meters per foot. To convert the speed to meters per second, we multiply by a conversion factor of 0.44704 meters per mile and divide by 3600 seconds per hour. Therefore, the expression that can be used to calculate the amount of time in seconds is:

(100 * 0.3048) / (20 * 0.44704) * 3600 = 6.556 seconds