A man walking at the rate of 5 km/hr crosses a bridge in 15 minutes. The length of the bridge (in metres) is
A. 600 B. 750n
C. 1000 D. 1250

• D. 1250
  
  A man walking at the rate of 5 km/hr crosses a bridge in 15 minutes. The length of the bridge (in metres) = 5000*15/60 =5000/4 = 1250 mtrs
• 13 years agoHelpfull: Yes(3) No(0)
• Length of Bridge=Speed*Time
  Speed=5km/hr
  Time=15 Minutes
  [length of bridge in meters]
  So
  speed==>5*(5/18) [5/18 for convert km/hr into m/hr]
  ==>[5*(5/18)*15]/60 [60 for convert 15 minutes into seconds]
  ==>1250
  Ans:D
• 13 years agoHelpfull: Yes(2) No(0)
• The distance is asked (in metres) so first convert the quantities in appropriate measurements
  
  time = 15 min = 15 * 60 = 900 seconds
  speed = 5 km/hr = 5 * (5/18) = 25/18 m/sec
  
  The distance formula is:
  
  Speed = Distance / Time
  => Distance = Speed * Time
  => Distance = 25/ 18 * 900
  => Distance = 1250 metres
  
  Hence, the correct option is .....D.....
• 9 years agoHelpfull: Yes(1) No(0)
• D. 1250
  5km*(15/60)=5000 mts *(15/60)=5000*(1/4)=1250mt
• 8 years agoHelpfull: Yes(0) No(0)