Two pendulums differ in lengths by $22\,cm$ . They oscillate at the same place such that one of them makes $15\,oscillations$ and the other makes $18\,oscillations$ during the same time. The lengths (in $cm$ ) of the pendulums are 
  • A$72$ and $50$
  • B$60$ and $38$
  • C$50$ and $28$
  • D$80$ and $58$
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