A person covers a certain distance at a certain speed. If he increases his speed by 25 % then he takes 12 minutes less to cover the same distance. Find the time taken by him initially to cover the distance at the original speed
a)3 hrs b)2 hrs c)1 hr d)7 hrs

• let speed of the car 100 km/hr
  time =t hrs
  d=t*100
  the speed is increased by 25% the new speed is 125 km/hr
  time is decreased by 12 sec new time = t- 12/60 hrs
  
  100 * t = 125 *(t - 12/60)( distance traveled is same)
  t= 1 hr
  
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