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 diagonals of a rhombus are 72 cm and 30 cm respectively . what is its perimeter ?
Options: ['a ) 136 cm', 'b ) 156 cm', 'c ) 144 cm', 'd ) 121 cm', 'e ) 126 cm']
b

Problem: a worker earns $ 20 on the first day and spends $ 15 on the second day . the worker earns $ 20 on the third day and spends $ 15 on the fourth day . if this pattern continues , on which day will the worker first reach a net total of $ 90 ?
Options: a ) 28 , b ) 29 , c ) 31 , d ) 34 , e ) 36
b

Problem: a train , 800 meter long is running with a speed of 78 km / hr . it crosses a tunnel in 1 minute . what is the length of the tunnel ( in meters ) ?
Options: a ) 440 m , b ) 500 m , c ) 260 m , d ) 430 m , e ) 450 m
b