#3 Problems on Trains

Two cogged wheels of which one has 32 cogs and other 54 cogs, work into each other. If the latter turns 80 times in three quarters of a minute, how often does the other turn in 8 seconds?

A) 48 B) 24 C) 38 D) 36

 Answer: B) 24 

Explanation:

Less Cogs  more turns and less time  less turns

Number of turns required=80 × × = 24 times