In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
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Question: Problem: cole drove from home to work at an average speed of 30 kmh . he then returned home at an average speed of 90 kmh . if the round trip took a total of 2 hours , how many minutes did it take cole to drive to work ? 
Options: a ) 66 , b ) 70 , c ) 72 , d ) 75 , e ) 90

Answer: e


Question: Problem: in what time will a train 100 metres long cross an electric pole , if its speed be 144 km / hr ? 
Options: a ) 2.5 sec , b ) 4.25 sec , c ) 5 sec , d ) 12.5 sec , e ) none

Answer: a


Question: Problem: a and b can do a piece of work in 16 days , b and c in 24 days , c and a in 12 days . how long will c take to do it ? 
Options: a ) 16 days , b ) 55 days , c ) 24 days , d ) 32 days , e ) 22 days

Answer:
d