Question
Three boys runs around a circular track and takes 24
min, 40 min and 42 min respectively to complete the one round. When do they all come relatively to the same position as at a certain point of time in their path?Solution
∴  Required time = LCM of (24, 40 and 42) = 840 min Hence, after 840 min they all come relatively to the same position as at a certain point of time in their path.
More HCF and LCM Questions
36   37    33   42    ?      51    15
...80, 116, 52, ?, 8, 204
What will come in place of the question mark (?) in the following number series?
21, 42, 67, 96, ?, 166
38, 41, 50, ?, 158, 401Â
23, 28, 38, 49, 62, ?
64, 80, 120, 210, ?, 945
12, 33, 45, 78, 123, 201, ?
415 246 367 ? 335 310
...Find the missing number, in the given number series.
25, 30, 40, 57, ?, 120
- 6, ?, 9816, 9825, 19429, 19438
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