Question

a body takes 2 hour to move from A to B and 3 hour to come back . the distance between A and B is 200 km fins average speed and average velocity

Answer 1

Time = 0 hr, Distance = 0 km        - at A
Time = 2 hr, Distance = 200 km    - at B
Time = 3 hr, Distance = 0 km        - at A

V(avg.) = ( D(3) - D(0) ) / ( 3 - 0 ) = ( 0 - 0 ) / 3 = 0
S(avg)  = ( 400 - 0 ) / (3 - 0) = 400/3

Answer 2

a_______200km_________b
returned journey=200×2=400km
total distance covered=400km
time taken to cover the journey=2hrs+3hrs=5hrs
formula=average upon speed
=400 kms upon 5 hrs
=80 kms / hr
ANSWER=the body will move at the speed of 80 kms /hr