Question

a person walking in a triangular path of side 20 cm ,30cm, 40cm .he has travelled 2times the perimeter in 20 sec find the speed of the person?

Answer 1

perimeter of triangle
= 20cm+30cm+40cm
= 90cm

total distance he has traveled
= 2× perimeter of triangle
= 2×90
= 180cm

Distance = d = 180cm
time= t = 20sec
speed = v = ?

V= d/t
V = 180 cm/20sec
V = 9cm/sec

so the speed of the person is = v = 9cm/sec

Answer 2

Speed of person will be 0.09m/sec