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 Input:
Problem: two trains , one from howrah to patna and the other from patna to howrah , start simultaneously . after they meet , the trains reach their destinations after 49 hours and 25 hours respectively . the ratio of their speeds is ?
Options: a ) 4 : 9 , b ) 5 : 7 , c ) 4 : 5 , d ) 4 : 1 , e ) 4 : 2

Ex Output:
b

Ex Input:
Problem: a cargo ships engines failed 100 miles away from the port . due to the changing wind direction , it is moving 12 miles towards the port and 6 miles away from the port . if the wind pattern remains same , how many miles it will travel before reaching the port ?
Options: a ) a - 179 , b ) b - 240 , c ) c - 280 , d ) d - 100 , e ) e - 155

Ex Output:
c

Ex Input:
Problem: how long does a train 140 m long running at the speed of 72 km / hr takes to cross a bridge 132 m length ?
Options: a ) 13.6 sec , b ) 12.1 sec , c ) 17.9 sec , d ) 16.8 sec , e ) 14.9 sec

Ex Output:
a