The ratio of the speed of P, Q and R is 10 : 12 : 15 respect

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The ratio of the speed of P, Q and R is 10 : 12 : 15 respectively. What is the ratio of the time taken by P, Q and R respectively to cover the same distance?

[SSC CPO 4 July 2017 Afternoon Shift With Answers]

A 10 : 12 : 15

B 15 : 12 : 10,

C 6 : 5 : 4,

D 4 : 5 : 6,