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: a cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.2 m and its walls are 5 cm thick . the thickness of the bottom is :
Options: a ) 90 cm , b ) 2 dm , c ) 1 m , d ) 1.1 cm , e ) none of these
b

Problem: due to construction , the speed limit along an 7 - mile section of highway is reduced from 55 miles per hour to 35 miles per hour . approximately how many minutes more will it take to travel along this section of highway at the new speed limit than it would have taken at the old speed limit ?
Options: a ) 2 , b ) 3 , c ) 4 , d ) 5 , e ) 6
c

Problem: if a train , travelling at a speed of 160 kmph , crosses a pole in 9 sec , then the length of train is ?
Options: a ) 281 , b ) 125 , c ) 288 , d ) 266 , e ) 400
e