A train covers a distance of 10 km in 12 minutes. If its speed is decreased by 5 km/hr the time taken by it to cover the same distance will be

A. 10 min. 50 sec

B. 12 min.

C. 13 min. 20 sec

D. 10 min. 30 sec

• distance=10km time=12min=12/60=1/5hrs
  speed=distance/time
  speed=10*5=50km/hr
  speed is decreased by 5km/hr
  new speed=50-5=45km/h
  distance =10km
  time=dis/speed
  time=10/45=2/9hrs
  2/9 hrs=2*60/9=13min 20sec
  that means option C. is correct
  
• 9 years agoHelpfull: Yes(2) No(0)
• time taken=12 min=12/60 hr
  speed=10*60/12=50
  reduced speed=50-5=45 km/hr
  time taken=(10/45)*60=13min 33sec
• 9 years agoHelpfull: Yes(1) No(0)