TASK DEFINITION: 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'.
PROBLEM: Problem: a car drives 90 miles on local roads at 30 mph , and 75 miles on the highway at 60 mph , what is the average speed of the entire trip ? 
Options: a ) 36 mph , b ) 40 mph , c ) 39 mph , d ) 42 mph , e ) 38 mph

SOLUTION: c

PROBLEM: Problem: a can do a piece of work in 10 days . he works at it for 4 days and then b finishes it in 9 days . in how many days can a and b together finish the work ? 
Options: a ) 6 , b ) 7 , c ) 5 , d ) 4 , e ) 1

SOLUTION: a

PROBLEM: Problem: a train is 357 meter long is running at a speed of 42 km / hour . in what time will it pass a bridge of 137 meter length ? 
Options: a ) 44 , b ) 42.343 , c ) 50 , d ) 39.252 , e ) 27.851

SOLUTION:
b