profile-img
Eduncle posted an MCQ
October 20, 2019 • 20:20 pm 0 points
  • CSIR NET
  • Physical Sciences

A bird flies along the three sides of a field in the shape of an equilateral triangle at speeds of 2, 4, 8 km/hr, respectively. The average speed of the bird is

Choose Your Answer:
0 Attempts Submit Now
  • 0 Likes
  • 1 Comments
  • 0 Shares
  • comment-profile-img>
    Eduncle Best Answer

    Average speed = total distance covered/ time taken. 
    Let side of equilateral triangle = a km. 
    Total distance covered = (a + a + a) km = 3a km. 
    Time taken = sum of time taken by each side = (a/2 + a/4 + a/8)hr. Þ 7/8 a hr. 
    Hence average speed = 3a/(7/8a) Þ 24/ 7 km./hr.

whatsapp-btn

Do You Want Better RANK in Your Exam?

Start Your Preparations with Eduncle’s FREE Study Material

  • Updated Syllabus, Paper Pattern & Full Exam Details
  • Sample Theory of Most Important Topic
  • Model Test Paper with Detailed Solutions
  • Last 5 Years Question Papers & Answers