Question

A car is traveling at a constant speed of 45 miles per hour. How many feet does it travel in 3 seconds? Remember that 1 mile is 5280 feet.

Answer 1

First you can convert 45 miles per hour to feet per hour:

45 × 5,280 = 237,600 feet per hour

Now you must remember that there are 60 minutes in an hour, and 60 seconds in a minute. So you can divide 237,600 feet per hour by 60 to get feet per minute:

237,600 ÷ 60 = 3,960 feet per minute

Now you just have to divide 3,960 by 60 again to get feet per second:

3,960 ÷ 60 = 66 feet per second

Now you know how fast the car can travel (in feet) in a second. So to work out how many feet it travels in 3 seconds, you just have to multiply 66 by 3:

66 × 3 = 198 feet

Therefore your final answer is 198 feet :)