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'.

[EX Q]: Problem: what is the least number of square tiles required to pave the floor of a room 11 m 50 cm long and 1 m 50 cm broad ? 
Options: a ) 724 , b ) 804 , c ) 69 , d ) 844 , e ) none
[EX A]: c

[EX Q]: Problem: train a leaves the station traveling at 30 miles per hour . two hours later train в leaves the same station traveling in the same direction at 36 miles per hour . how many miles from the station was train a overtaken by train b ? 
Options: a ) 320 , b ) 360 , c ) 400 , d ) 440 , e ) 480
[EX A]: b

[EX Q]: Problem: a train covers a distance of 16 km in 10 min . if it takes 6 sec to pass a telegraph post , then the length of the train is ? 
Options: a ) m , b ) m , c ) m , d ) m , e ) m
[EX A]:
c