Question

On Ashok Marg, three consecutive traffic lights
change after 36, 42, and 72 seconds, respectively. If
the lights are first switched on at 9:00 A.M. sharp,
at what time will they change simultaneously?
(a) 9 : 08 : 04 (b) 9:08 : 24
(c) 9 : 08 : 44 (d) None of these

LCM = 504 secs
Isn't 504/60 = 8.4 mins? Then how will the answer be 8.24 mins?

Answer 1

Answer:

d)non of these should be the ans I think

Answer 2

Answer:

d. is your answer.

Step-by-step explanation:

second one I don't know