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There is a circular path around a sports...

There is a circular path around a sports field. Priya takes 21 minutes to drive one round of the field, while Ravish takes 28 minutes for the same. Suppose they both started 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

18

B

12

C

84

D

36

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MTG IIT JEE FOUNDATION-REAL NUMBERS-Exercise (Multiple Choice Questions) (LEVEL-1)
  1. A rational number p/q has a terminating decimal expansion if prime fac...

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  2. 2.bar(27) is

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  3. If n is a natural number, then 9^(2n)-4^(2n) is always divisible by 5 ...

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  4. If n is any natural number, then 9^(n)-5^(n) ends with

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  5. Which of the following rational numbers have non-terminating repeating...

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  6. If p and q are primes, then H.C.F. (p, q) will be

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  7. If H.C.F. (306, 1314) = 18, then L.C.M. (306,1314) is

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  8. Any positive integer cannot be of the form (q in N)

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  9. Which of the following is not a prime factor of 3825?

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  10. If p is prime, then H.C.F. and L.C.M. of p and p+1 would be

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  11. After how many places, the decimal form of (125)/(2^(4).5^(3)) will te...

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  12. n^(2)-1 is divisible by 8, if n is

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  13. 144 cartons of Coke Cans and 90 cartons of Pepsi Cans are to be sta...

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  14. There is a circular path around a sports field. Priya takes 21 minutes...

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  15. If d is the H.C.F. of 30, 72, find the value of x & y satisfying d=30...

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  16. Find the missing numbers x, y and z respectively in the following fact...

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  17. Express 2.4bar(178) in the form p//q.

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  18. The value of 1.bar(34)+4.bar12 is

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  19. For what least value of n where n is a natural number 5^n is divisible...

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  20. Which of the following is a pair of co-primes ?

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