2010 AMC 12B Problems/Problem 7
Problem 7
Shelby drives her scooter at a speed of miles per hour if it is not raining, and miles per hour if it is raining. Today she drove in the sun in the morning and in the rain in the evening, for a total of miles in minutes. How many minutes did she drive in the rain?
Solution
Let be the time it is not raining, and be the time it is raining, in hours.
We have the system: and
Solving gives and
We want in minutes,
See also
2010 AMC 12B (Problems • Answer Key • Resources) | |
Preceded by Problem 6 |
Followed by Problem 8 |
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