Neeraj and Nidhi start walking along a circular track continuously with a message "To stop child labour".Neeraj complete one round in 28 minutes and Nidhi takes 42 minutes to complete one round.If they start in same direction,after how many minutes both meet together at the starting point
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See its easy.
Have a look at the first full rotation of both of them. When Neeraj completes full circle Nidhi lags behind him by 14 mins. If 'd' be the circumference of the circle, then,
For Nidhi,
42 mins is takes to complete d
1 min is takes to cover d/42
and 28 mins is taken to cover 2d/3
which means when Niraj covers a full circle, Nidhi covers its 2/3.
This means Nidhi lags behind Niraj by 1/3 diatance.
To cover this up, Nidhi requires three sets of rotations to actually meet Niraj.
This gives 28+28+28=84 mins.
Have a look at the first full rotation of both of them. When Neeraj completes full circle Nidhi lags behind him by 14 mins. If 'd' be the circumference of the circle, then,
For Nidhi,
42 mins is takes to complete d
1 min is takes to cover d/42
and 28 mins is taken to cover 2d/3
which means when Niraj covers a full circle, Nidhi covers its 2/3.
This means Nidhi lags behind Niraj by 1/3 diatance.
To cover this up, Nidhi requires three sets of rotations to actually meet Niraj.
This gives 28+28+28=84 mins.
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Answer:
take out lcm and hcf
Step-by-step explanation:
hint
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