The inner circumference of a circular race track, 25 m wide, is 880 m. Find radius of the outer circle?
Choose the most appropriate option.
A) 165m  B) 120m  C) 100m  D) 190m  E) 220m
Let inner radius be r metres. Then, 2Πr = 880 ⇔ r = (880 x (7/44))= 140 m.   Radius of outer circle = (140 + 25)= 
<gadget id="calculator">(140 + 25)</gadget>
<output>165</output>
165 m.   hence 165m
<result>A</result>
The inner circumference of a circular race track, 25 m wide, is 880 m. Find radius of the outer circle?