SSC CGL Tier II 25 Oct 2015 Paper 1

(3) Circumference of the wheel of car $=\mathrm{\pi }\times \mathit{d}$ $=\frac{22}{7}\times 70=220\mathrm{cm}$ = Distance covered in one rotation
∴Distance covered by car in 1 minute = (400 × 220) cm.
∴ Distance covered by car in 1 hour = (400 × 220 × 60) cm.
$=\left(\frac{400\times 220\times 60}{1000\times 100}\right)\mathit{k}\mathit{m}$ $=52.8\mathit{k}\mathit{m}.$
∴ Speed of car = 52.8 kmph