An athlete runs 8 times around a circular field of radius 14 m in 2 minutes 56 second. Find his speed.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 4 m/sec.
Given:
An athlete runs 8 times around a circular field of radius 14 m in 2 minutes 56 second
Formula used:
Circumference of circle = 2πr ---- (1)
Speed = Distance/time ---- (2)
Calculations:
According to the question,
Total length of the circular track = 2 × (22/7) × 14 = 88 m
He runs 8 times, so total distance covered = 8 × 88 = 704 m
Total time taken = 2 minutes 56 seconds = 176 sec
Using equation (2), we get
Speed = 704/176 = 4 m/sec