SOLUTION: 1mile=5280ft please help solve The oil in a lawn mower needs to be changed with every 20 hours of use. If the mower travels 70 feet in 30 seconds and shuts off when stopped, ho

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Question 996683: 1mile=5280ft
please help solve
The oil in a lawn mower needs to be changed with every 20 hours of use. If the mower travels 70 feet in 30 seconds and shuts off when stopped, how many miles will it travel between oil changes? (Round your answer to one decimal place.)

Found 2 solutions by addingup, josmiceli:
Answer by addingup(3677) About Me  (Show Source):
You can put this solution on YOUR website!
The lawn mower travels 70ft in 30sec. And you change the oil every 60*60*20= 72,000 seconds.
(72,000/30)*70= 16,800 feet in 20 hours.
1 mile= 5,280 feet
16,800/5,280 = 31.82 miles between oil changes

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
I'll convert 30 sec to hrs:
[ sec ] x [ min/sec ] x [ hrs/min ] = [ hrs ]
+30%2A%281%2F60%29%2A%281%2F60%29+=+30%2F3600+
+30%2F3600+=+1%2F120+ hrs
----------------------
[ ft/hr ] x [ hrs ] = [ ft ]
+70+%2F+%28+1%2F120+%29%2A20+=++70+%2A+120+%2A+20+
++%28+70%2A120+%29+%2A+20+=70%2A2400+
+70%2A2400+=+168000+ ft
and
+168000+%2F+5280+=+31.82+ mi
Hope I got it