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  • Question

  • The wheel of a motorcycle 70cm in diameter makes 40 revolutions in every 10sec.What is the speed of motorcycle n km/hr?


  • Options
  • A. 13.68kmph
  • B. 31.68kmph
  • C. 41.68kmph
  • D. 45.68kmph

  • Correct Answer
  • 31.68kmph 

    Explanation

    In this type of question, we will first calculate the distance covered in given time.

     

    Distance covered will be : Number of revolutions x Circumference 

     

    So we will be having distance and time, from which we can calculate the speed. 

     

    Radius of wheel = 70 / 2 = 35 cm

     

    Distance covered in 40 revolutions will be  40 * c i r c u m f e r e n e = 40 * 2 ?r = 40 * 2 * 22 7 * 35 = 8800 cm  = 88 m

     

    Distance covered in 1 sec  =  88 10 = 8 . 8 m / s = 8 . 8 * 18 5 k m / h r = 31 . 68 k m / h r

     

     

     

     

     

     

     

     

    • Area problems

    Search Results

    • 1. The ratio between the length and breadth of a rectangular field is 5 : 4 if the breadth is 20m less than the length, the perimeter of the field is :

    • Options
    • A. 260m
    • B. 280m
    • C. 360m
    • D. none of these
      • Discuss
    • 2. The lengths of diagonals of a rhombus are 24cm and 10cm the perimeter of the rhombus (in cm ) is :

    • Options
    • A. 52
    • B. 56
    • C. 68
    • D. 72
      • Discuss
    • 3. The perimeter of an isosceles triangle is 32 cm and each of the equal sides is 5/6 times of the base. What is the area (in cm2 ) of the triangle ?

    • Options
    • A. 39
    • B. 48
    • C. 57
    • D. 64
      • Discuss
    • 4. A rectangular grassy plot 120 m. by 60 m has a gravel path 1.5 m wide all round it on the inside. Find the cost of gravelling the path at 65 paise per sq. metre ?

    • Options
    • A. Rs. 345.15
    • B. Rs. 245.1
    • C. Rs. 234.18
    • D. Rs. 456.65
      • Discuss
    • 5. The area of a square is 1024 sq.cm. What is the ratio of the length to the breadth of a rectangle whose length is twice the side of the square and breadth is 12 cm less than the side of this square ?

    • Options
    • A. 14:9
    • B. 13:12
    • C. 16:5
    • D. 17:13
      • Discuss
    • 6. The base of a triangle of 15cm and height is 12cm. The height of another triangle of double the area having the base 20cm is

    • Options
    • A. 16
    • B. 17
    • C. 18
    • D. 20
      • Discuss
    • 7. The inner circumference of a circular race track, 14m wide is 440m. Find the radius of the outer circle.

    • Options
    • A. 84m
    • B. 24m
    • C. 44m
    • D. 54m
      • Discuss
    • 8. If 4 circles of equal radius are drawn with vertices of a square as the centre , the side of the square being 7 cm, find the area of the circles outside the square ?

    • Options
    • A. 119.21 sq cm
    • B. 115.395 sq cm
    • C. 104.214 sq cm
    • D. 111.241 sq cm
      • Discuss
    • 9. A rectangular lawn of dimensions 80 m x 60 m has two roads each 10 m wide running in the middle of the lawn, one parallel to the length and the other parallel to the breadth. What is the cost of traveling the two roads at Rs.3 per sq m ?

    • Options
    • A. Rs. 3600
    • B. Rs. 3800
    • C. Rs. 3900
    • D. Rs. 3700
      • Discuss
    • 10. The perimeter of a rectangle whose length is 6 metre more than its breadth is 84 metre. What is the area of the triangle whose base is equal to the diagonal of the rectangle and height is equal to the length of the rectangle?

    • Options
    • A. 360sq metre
    • B. 380 sq metre
    • C. 360 metre
    • D. 400 sq metre
      • Discuss

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