A) 140 : 144 : 147
B) 40 : 44 : 47
C) 15 : 21 : 28
D) 252 : 345 : 240
Correct Answer: A
Solution :
Frequency of step of A : B : C = 5 : 6 : 7 but it terms of size of step, 6A = 7B = 8C \[\therefore \] Ratio of Speeds of A, B and \[C=\frac{5}{6}\,:\,\frac{6}{7}:\,\frac{7}{8}\] = 280 : 288 : 294 = 140 : 144: 147You need to login to perform this action.
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