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: two passenger trains start at the same hour in the day from two different stations and move towards each other at the rate of 14 kmph and 21 kmph respectively . when they meet , it is found that one train has traveled 60 km more than the other one . the distance between the two stations is ? 
Options: a ) 477 , b ) 420 , c ) 279 , d ) 276 , e ) 291
b

Problem: the reciprocal of the hcf and lcm of two are 1 / 13 and 1 / 312 . if one of the number is 24 then other no . is 
Options: a ) 126 , b ) 136 , c ) 146 , d ) 156 , e ) 169
e

Problem: how many plants will be there in a circular bed whose outer edge measure 31 cms , allowing 4 cm 2 for each plant ? 
Options: ['a ) 19', 'b ) 750', 'c ) 24', 'd ) 120', 'e ) none of these']

a