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Digital Counters

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Q..A 4 bit Counter having flip-flops with identical propagation delay time of 50ns will have maximum frequency limit of ____ MHZ???

My question is how to know wheather the question is talking about Synchronous counter or Asynchronous counter???
For Sync. it will be 1/50ns    for Async. it will be 1/(4*50)ns   which obe to take?????
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as maximum delay is asked, so in ripple counter the last F/F has max delay.. so they have taken 1 / 4*T
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