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

a) 9 b) 10 c) 12 d) 20

• b)10 minutes
  
  By including stoppages, bus will cover 9km less..(54km -45km = 9km)
  
  Excluding stoppages, x = 54 kmph
  Including stoppages, y = 45 kmph
  Difference, z = 9km
  
  Time taken to cover that 9km(bus stops per hour(60minutes))= z/x(60minutes)
  = 9/54(60)
  = 1/6(60)
  = 10minutes.
• 12 years agoHelpfull: Yes(20) No(5)
• Suppose bus stops for x minutes per hour, then
  distance travelled = 54*(60-x) = 45*60
  x=10 mins
• 9 years agoHelpfull: Yes(4) No(0)
• Due to stoppages, it covers 9 km less.
  
  Time taken to cover 9 km = 9x 60 min = 10 min.
  
• 9 years agoHelpfull: Yes(0) No(2)