Excluding stoppages, the speed of a bus is 54 km/hr and including stoppages, it is 45 km/hr. For how many minutes does the bus stop per hour ?

1) 12
2) 9
3) 15
4) 10

• 4) 10.
  without stoppage speed=54km/hr
  including stopaage..speed=45km/hr
  means 9km less than without stoppage.
  
  in 1hr bus runs 54 km
  therefore in 1 mints it runs 9/10km
  therefore for 1 km it takes 10/9 mints
  therefore for 9 km,
  (10/9)*9=10mints
• 11 years agoHelpfull: Yes(3) No(0)