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Density of a fluid - class-XI

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Multiple Choice

By cooling two liquids of equal volume from temperature $60 ^ { \circ } \mathrm { C }$  to $50 ^ { \circ } \mathrm { C }$ in same conditions time required are 324 and 810 sec respectively. If ratio of specific heat of both are 3:4. Then ratio of their. densities (water equivalent of calorimeter is negligible ):

  1. 3 /4
  2. 4 /9
  3. 8 /15
  4. 9 /20