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oscar drove 136km away at 48 km per hour. he drove the next day at 60 km per hour. how many hours in total did oscar spend driving

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1 Answer

distance=rate*time
d=rt
136=48t
136=60t
136/48=t
2.8333... hours
136=60t
136/60=t
2.2666...hours
add the two times together
    2.8333...
+  2.2666...
_____________
    5.0999...=5.1 hours
another solution...
136/48+136/60=t
find a common denominator
60=2*2*3*5
48=2*2*2*2*3
LCD=2*2*2*2*3*5=240
136/48=680/240
136/60=544/240
680/240+544/240=t
1224/240=t
5.1=t
t=5.1 hours