A girl while walking diametrically across a semicircular playground, takes 3 minutes less than if she had kept walking round the circular path from A to B. If she walks 60 metres a minute, what is diameter of the play ground?
A. 60 m
B. 48 m
C. 84 m
D. 315 m
E. None of these
Answer: Option D
Solution(By Examveda Team)
Let the radius be r, then difference in the distance, πr - 2r = r (π - 2) = r [(3.14) -2] = 60 × 3 2r = 315 m. [πr = semi perimeter, 2r = diameter]Join The Discussion
Comments ( 1 )
Related Questions on Speed Time and Distance
A. 48 min.
B. 60 min.
C. 42 min.
D. 62 min.
E. 66 min.
A. 262.4 km
B. 260 km
C. 283.33 km
D. 275 km
E. None of these
A. 4 hours
B. 4 hours 30 min.
C. 4 hours 45 min.
D. 5 hours
Why no one solve it alternatively?