Question

a train moves with speed of 30km/h in the first 15 min with another speed of 40 km/h the next 15 min and then with a speed of 60km/h in the last 30min . calculate the average speed of the train for the journey.(ANSWER 47.5km/h)

Answer 1

HEYA!
--------


----------------------------------------------------------------------------------------------------
✴AVERAGE SPEED ✴
------------------------------------------------------------------------------------------------------


$= > average \: speed \: = \frac{total \: distance}{total \: time}$

Distance 1 = 30×15

= 450m

Distance 2 = 40×15

= 600m

Distance 3 = 60×30

= 1800m

Total distance = 1800+600+450

= 2850m


Total time = 15 + 15+30

= 60 .


Thus ,


$average \: speed \: = \frac{2850}{60} = \frac{285}{6} \\ \\ = 47.5kmh {}^{ - 1}$
-----------------------------------------------------------------------------------------------------

Answer 2

Answer:

Hope my answer helps.