question_answer

Two defective clocks, A and B, were set to the same time at the same time. Clock A lost 2 minutes per hour whereas Clock B gained 1 minute per hour. When the times on the 2 clocks were noted again, they were 1 hour apart. How much time had past?

A)  20 hours         

B)         10 hours

C)  5 hours          

D)         12 hours