Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

An athlete completes one round of a circular track

of radius 10m in 40sec.The distance covered by
him in 2min 20sec is (a)70m (b)140m (c)110m


(d). 220m.
circumfrence of circle=2πr
r=10.i.e 2*3.14*10
=2*31.4 in 40 sec.
dist. covered into 1 sec=2*31.4/40=1.57.
dist covered into 120+20=140 sec=1.57*140=219.8
approx 220 m

1 5 1
R=10 m
                    =62.85 m
t=40 s
total time=2*60+20
             =140 s
distance ran=140*62.85/40
                  =219.975 m
                  =220 m
1 5 1
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts