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

A. 9 B. 10
C. 12 D. 20

• For simplicity, Suppose distance travelled is 270 kms.
  
  Time taken without stppages = 270/54 = 5 hrs
  Time taken with stoppages = 270/45 = 6 hrs
  
  time for stoppage in 6 hrs = 6-5=1 hr
  time for stoppage in 1 hrs = 1/6 hr = 10 minutes ..... option B
  
• 13 years agoHelpfull: Yes(18) No(9)
• Due to stoppages it covers 9km
  time taken to cover 9km=9/54=1/6hr
  60/6=10min
• 10 years agoHelpfull: Yes(9) No(2)
• Answer is A. 54KMPH means 900 meters per minute. 45kmph means 750 meters per minutes. 900 * 51 minutes = 45KMph. So 9 minutes, bus was stopped.
• 13 years agoHelpfull: Yes(3) No(17)
• 10 stops per hour
• 13 years agoHelpfull: Yes(3) No(5)
• why not this solution
  assume distance =54km
  
  54km/1hr with out stoppages
  
  at same time 54km will cover 45 km/hr with stoppages
  54km/45km/hr=6/5hr=1.12hrs
  
  total minutes is 1.12-1=12mins
  
  
  
• 10 years agoHelpfull: Yes(2) No(7)
• because of the stoppages it covers 9km less ...
  therfore (9/54*60)=10minutes will be the ans
  
• 10 years agoHelpfull: Yes(2) No(1)
• answer is 10
• 9 years agoHelpfull: Yes(0) No(0)