Problem Solving (PS) | Re: If during a one-day period the Q train arrives at the station 30% less

Let us assume that the frequency of train F is x. Then the frequency of train B is 9x/10.
Therefore, frequency of train Q is 70% of 9x/10 which is 63x/100.
Hence, the frequency of Q train is 63% of the frequency of train F.

The answer is D.

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