A field roller, in a shape of a cylinder, has a diameter of 1 m and length of 
. If the speed at which the roller rolls is 14 revolutions per minute, then the maximum area (in m²) that it can roll in 1 hour ?
(Take π = 22/7)
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 ie 3300.
= 14 × 60 × 2πrh
= 80 × 60 × (1/2) × (5/4)
= 60 × 55
= 3300