Problema Solution
Carla and Patrick rode stationary bikes for the same amount of time. Carla rode at 7 miles per hour, and Patrick rode at 4.5 miles per hour. If Carla rode 1.88 miles farther than Patrick, how long did they use the bikes?
Answer provided by our tutors
Let
x = the distance that Patric rode the bike
x + 1.88 = the distance that Carla rode the bike
Since the both rode the bikes the same time and we know that speed = distance/time follows time = distance/speed:
x/4.5 = (x + 1.88)/7
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x = 3.384 mi
Now we find the time: 3.384/4.5 = 0.752 hr = 0.752*60 min = 45.12 min = 45 min 0.12*60 sec = 45 min 7.2 sec.