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'.

Input: Consider Input: Problem: calculate the speed of a boat in still water ( in km / hr ) if in one hour , the boat goes 10 km / hr downstream and 4 km / hr upstream .
Options: a ) 7 kmph , b ) 8 kmph , c ) 9 kmph , d ) 7 kmph , e ) 6 kmph

Output: a

Input: Consider Input: Problem: if 4 spiders make 3 webs in 9 days , then how many days are needed for 1 spider to make 1 web ?
Options: a ) 9 , b ) 12 , c ) 27 , d ) 24 , e ) 16

Output: b

Input: Consider Input: Problem: a train speeds past a pole in 25 seconds and a platform 500 m long in 35 seconds . its length is :
Options: a ) 1150 m , b ) 2250 m , c ) 1450 m , d ) 1350 m , e ) 1250 m
Output: e