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Ravi, Sana and Tara start running together from the start line of a circular track in Bhopal at 7:00 a.m. Their lap times are shown. When will all three next be at the start line together?

Class 10Fundamental Theorem of ArithmeticNumber Systems
  • A7:45 a.m.
  • B8:30 a.m.
  • C10:00 a.m.
  • D7:03 a.m.

Step-by-Step Solution

. LCM min hours, so at 10:00 a.m. (45 min adds the times; 90 min is LCM(15, 18) only; 3 min is the HCF.)
Answer: C) 10:00 a.m.

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