question_answer

Seema, Meena and Reema begin to walk around a circular stadium and they complete their revolutions in 54 s, 42 s and 63 s, respectively. After approximately how many minutes will they come together at the starting point?

[SSC (CGL) 2011]

A) 8 min               

B) 10 min

C) 3 min               

D) 6 min

Correct Answer: D

Solution :

LCM of 54, 42 and 63 = 378 s = 6.3 min

Hence, after 6 min (approx.) they will come together at the starting point.