Need help with converting math

Question

Use unit multipliers to convert 335 miles per hour to feet per second. Round your answer to

the nearest hundredth.

Answer 1

1 mile = 5280 feet,

1 hour = 60 minutes

1 minute = 60 seconds

1 hour = 60 x 60 = 3600 seconds

1 mph = 5280/3600 feet per second =1.4666... ft/sec

335 miles per hour= 335 x 1.4666...= 491 1/3 ft/sec

= 335 x 5280ft/3600sec = 1768800/3600 = 17688/36 = 491 and 1/3 foot per second

= 491.33 feet per second

Answer 2

One mile = 5280 feet

One hour = 3600 seconds

335 miles per hour = 335 (miles/hr) • (5280 feet/mile) / (3600 secs/hr) = 491.33 feet/sec