GMAT Practice Question Set #10 (Question 28-30)

Problem Solving Question #29: Circular Gears  
Time 0 0 : 0 0 : 0 0

Circular gears P and Q start rotating at the same time at constant speeds. Gear P makes 10
revs/min and gear Q makes 40 revs/min. How many secs after the gears start rotating will gear Q
have made actually 6 more revolutions than gear P?

(A)

6

(B)

8

(C)

10

(D)

12

(E)

15

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