Section A
1. There is a circular path around a sports field.
Sonia takes 28 min to drive one round of the
field, while Ravi takes 21 min for the same.
Suppose they both start at the same point
and at the same time and go in the same
direction. After how many minutes will they
meet again at the starting point?
(a) 70 (b) 84 (c) 80 (d) 65
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Answer:
for answer ur que we get LCM of 21and 28
21=7×3
28=2×2×7
LCM is =2×2×3×7=84
in 84 minutes they met again
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