Previous Year Paper
CAT-2004-Previous Years Paper
A sprinter starts running on a circular path of radius r metres. Her average speed (in m/min) is ðr during the first 30 s, during next one min, during next 2 mins, during next 4 mins, and so on. What is the ratio of the time taken for the nth round to that for the previous round?
As options are independent of n let n = 2
Time taken for the first round + 1 + 2 + 4 = 7.5 min
Time taken for the second round = 8 + 16 + 32 + 64 = 120 min
Ratio = 16