Question

Given the speeds of each runner below, determine who runs the fastest.

Noah runs 10 feet per second.
Brooke runs 489 feet in 36 seconds.
Stephanie runs 1 mile in 557 seconds
Liz runs 732 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.