Take a bicycle with following specifications:
--The front de-railer is on the 52 tooth gear and the rear de-railer is on the 14 tooth gear
--The rear gear has 14 teeth
--The diameter of the rear wheel is 27"

If a bicyclist pedals at 75 revolutions per minute, then what will be the speed achieved?
A. 22.38
B. 26.85
C. 25
D. 30

• Answer is OPTION B
  Circumfrence = 3.14 x 27 x 0.025 m = 21.20m
  Total Distance travelled = 75 x 21.20 = 1590m
  speed = 1590/60 = 26.85 m/s
• 9 years agoHelpfull: Yes(20) No(14)
• all the answers are wrong
  
  The exact solution is:
  
  Our aim is to find out the speed
  To find speed we need distance and time taken
  distance we dont know
  time we know it is 60 seconds
  
  So to find distance
  
  Circumference is pie * d
  3.142* 27* 0.025 ( the diameter is in inches so convert it to metre, 1 inch = 0.0254 meter)
  circumference is 2.12 meter
  Total distance is calculated basicaly using the concept of area covered
  here the area covered will be 75 * 2.12 ( bcoz he pedals 75 revolutions per min that has circumference of 2.12 meter
  Distance = 75*2.12 = 159 m
  Speed = d/t
  159/60 = 2.65 m/s
• 8 years agoHelpfull: Yes(16) No(2)
• Is dis questions repeat in the exams???
• 9 years agoHelpfull: Yes(15) No(0)
• the circumferance of the wheel = pie*d= 3.14*27=84.83. total time wheel roates in 1 pedal=52/14. total revolution in 1 minute= 75 therefore= 84.83*52/14*75== inches/minutes.convert it into m/min
• 9 years agoHelpfull: Yes(6) No(12)
• .025 m=1 inch
• 9 years agoHelpfull: Yes(2) No(2)
• 25
  circumference8*3*75
• 9 years agoHelpfull: Yes(0) No(5)
• i cant understand the question
  
• 9 years agoHelpfull: Yes(0) No(0)
• i can't understand the question
• 9 years agoHelpfull: Yes(0) No(0)
• Mr. Gupta can u plz tell me why did u multipy with 0.025m.....Actual formula is (pi*d)=3.14*27.....so can u substantiate ur ans as soon as possible....?
• 9 years agoHelpfull: Yes(0) No(0)
• please explain it clearly
  
• 9 years agoHelpfull: Yes(0) No(0)