3. A bus moves from the bus stop A to B with a constant
speed of 40 km/h and returns back from B to A with a
constant speed of 30 km/h. Find the average speed
and the
average velocity.
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Explanation:
average speed =total distance /time
let the distance travelled from A to B= x km
then,
total distance travelled = 2x km
time while going from A to B = D/S
=x/30 hours
time while returning = x/50 hours
total time = x/30 + x/50
=5x+ 3x
150
=8x/150
=4x/75 hours
average speed = 2x x 75
4x
37.5 km/hr..
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