A field roller is in the shape of a cylinder whose diameter is 2.5 metres and length is 5.6 metres.
If the roller rolls at a speed of 15 revolutions per minute, then find the maximum area (in m2) that it can roll in 45 minutes.
Show answer & explanation
Correct answer: C
Explanation
Radius = 1.25 meters
Area covered in one revolution = Circumference × Length
= 2 × 22/7 × 1.25 × 5.6
= 44 square meters
Total revolutions = 15 × 45 = 675
Total area = 44 × 675
= 29,700 square meters