Question
A, B and C start running at the same time and at the
same point in the same direction in a circular stadium. A completes a round in 720 seconds, B in 1080 seconds and C in 1800 seconds. After what time will they meet again at the starting point?Solution
Factors of 720 = 2 × 2 × 2 × 2 × 3 × 3 × 5 Factors of 1080 = 2 × 2 × 2 × 3 × 3 × 3 × 5 Factors of 1800 = 2 × 2 × 2 × 3 × 3 × 5 × 5 LCM = 23 x 33 × 5  = 1080 seconds Thus, required time = 1080 seconds = 18 minutes
How many coins does Q’s have?
Five friends are sitting around a circular table facing the centre. S sits on the immediate right of O, and is on the immediate left of T. Q sits on the...
H, I, J, K, L, M, N and O are sitting around a square table facing the centre of the table. Four of them are sitting at either of the corners while the ...
How many persons sit between J and P when counted from the left of J?
Which of the following statements is definitely false?
Seven persons I, J, K, L, M, N and O are sitting in the straight horizontal line facing towards the north. I sits extreme end of the line. One person si...
Who among the following person sits facing the one who likes Grapes?
Eight friends, Q, R, S, T, U, V, W and X are sitting in a line facing north. U is sitting at one of the corners. R is sitting between X and S. W is sitt...
If Piya sits second to the left of Jaya, then who sits fifth to the right of Piya? Â Â Â Â Â Â Â Â Â Â Â Â Â
...Who among the following faces M?
