What is the speed, in miles per hour, of a toy car that runs 40 feet in 8 seconds? Round your answer to the nearest whole number. (1 hour = 3600; 1 mile = 5280 ft)
1 hour = 60 minutes
1 minute = 60 seconds
so one hour = 3600 seconds
this is 3600/8 = 450 times of the given.
So in one hour, the car runs 450 * 40 = 18000 feet. 18000 / 5280 = roughly 3.4 miles
To the nearest whole number, the car goes at 3 miles per hour.
To find the speed of the toy car in miles per hour, we can use the formula:
Speed = Distance / Time
Given the distance of 40 feet and the time of 8 seconds, we can substitute these values into the formula:
Speed = 40 feet / 8 seconds
However, to express the speed in miles per hour, we need to convert feet to miles and seconds to hours.
There are 5280 feet in 1 mile, so we can convert the distance from feet to miles by dividing it by 5280:
Speed = (40 feet / 5280) miles / 8 seconds
To convert seconds to hours, we divide the time by 3600 (since there are 3600 seconds in an hour):
Speed = (40 feet / 5280) miles / (8 seconds / 3600)
Now we can simplify the expression:
Speed = (40 / 5280) miles / (8 / 3600) hours
Speed = (40 * 3600) miles / (8 * 5280) hours
Speed = 144000 miles / 42240 hours
Finally, we can calculate the speed by dividing the miles by the hours:
Speed ≈ 3.41 miles per hour
Rounding to the nearest whole number, the speed is approximately 3 miles per hour.