Machine A produces bolts at a uniform rate of 120 every 40 seconds, and machine produces bolts at a uniform rate of 100 every 20 seconds. If the two machines run simultaneously, how many seconds will it take for them to produce a total of 20 bolts?

Machine A produces bolts at a uniform rate of 120 every 40 seconds, and machine produces bolts at a uniform rate of 100 every 20 seconds. If the two machines run simultaneously, how many seconds will it take for them to produce a total of 20 bolts?

A 15

B 20

C 25

D 10

Solution

Correct Answer: Option C