Question

Given the speeds of each runner below, determine who runs the fastest. Emily runs 15 feet per second. Noah runs 358 feet in 36 seconds. Liz runs 1 mile in 405 seconds. Zach runs 768 feet in 1 minute.

Answer 1

Brooke
Explanation:
Since the first is already given in terms of rate (10 feet per second), we need to find the other rates. Remember, to convert to feet/sec rates.
Noah:
10 ft/sec
Brooke:
489 feet in 36 seconds means:
489/36 = 13.58 ft/sec
Stephanie:
1 mile is 5280 feet, so we can say:
5280 feet is 557 seconds, so rate is:
5280/557 = 9.48 ft/sec
Liz:
732 feet in 1 minutes. We know 1 minute is 60 seconds, so we can say:
732 feet in 60 seconds, so rate is:
732/60 = 12.2 ft/sec
Comparing all the rates (in ft/sec), we can say that "Brooke" is the fastest.