Use the following unit fractions to express 180 miles per hour in feet per second
5280 ft/ 1 mi, 60 min/ 1 hr , and 60 sec/1 min
Problem:
180 mi/hr=blank ft/sec

264 ft/sec

Step-by-step explanation:

We need to use the conversion factors

5280 ft/ 1 mi, 60 min/ 1 hr , and 60 sec/1 min

180 miles         1 hour               1 min        5280 ft

*  * *

hour                60 minutes       60 sec      1 miles

The hours, minutes and miles cancel are we are left with ft/sec

180 *5280        ft

*  

60*60                 sec      

264 ft/sec

264 ft/sec

Step-by-step explanation:

180 miles / hour

(180×5280) ÷ (1×60×60)

950400 ÷ 3600

264 ft/sec

50 min

step-by-step explanation:

they will be decreasing both their times in half

60 / 2 = 30

40/2 = 20

30 + 20 = 50