cv3t3l1na wrote:
Carol started from home on trip averaging 30 miles per hour. How fast must her mother drive to catch up her in 3 hours if she leaves 30 minutes after Carol?
A. 35 m.p.h
B. 39 m.p.h
C. 40 m.p.h
D. 55 m.p.h
E. 60 m.p.h
We know that Carol’s rate is 30, and let’s let her mom’s rate = r. We know that her mom will have driven for 3 hours, and Carol will have driven for (3 + ½), or 3.5, hours when her mom catches up. Using the formula distance = rate x time, and knowing that both Carol and her
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