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Re: some questions of TSD
by manu mehta - Tuesday, 14 April 2015, 12:46 AM
  I think the answer should be 20.
The horse cart took 30 min for the travel for which the motorist should have taken 10 min. So effectively, 30 - 10 = 20 mins have been saved and correspondingly the plane arrived 20 mins earlier. Isn't it?