CTS Company Numerical Ability LCM and HCF

Three friends Anil, Ravi and Sumit jog around a circular park and complete round in 21, 18 and 24 minutes respectively. In how many hrs will all the three meet again at starting point?

1) 8 hrs
2) 8.4 hrs
3) 6.5 hrs
4) 7.5 hrs
5) 9 hrs

Read Solution (Total 3)

Required time = LCM of 21, 18, 24 min = 504 mins = 8.4 hrs
8 years agoHelpfull: Yes(5) No(1)

Ans: 8.4 hrs

Sol: Take the LCM of 21, 18, 24 = 504,
As question is asking in Hours so divide by 60,
504/60 = 8.4 hrs
7 years agoHelpfull: Yes(1) No(0)
take lcm of 21,18 and 24 =504 min and divide by 60 we will get 8.4 hrs
5 years agoHelpfull: Yes(1) No(0)

CTS Other Question

What is the present age of Monika?
(A) Monika's present age is 2/11th of her father's age.
(B) Monika is older than her sister by 6 years.
(C) After four years, Monika's age will be 1/4th of her father's at that time.

Options
1) Both (A) and (C)
2) Both (A) and (B)
3) Both (B) and (C)
4) All (A), (B) and (C) Two candles of the same height are lighted at the same time. The first is consumed in 6 hours and the second in 4 hours. Assuming that each candle burns at a constant rate, in how many hours after being lighted, was the first candle was twice the height of the second?
1) 3.5 hrs
2) 2 hrs
3) 4 hrs
4) 3 hrs
5) 2.5 hrs