Question

a train moves with a speed of 30 km/h in first 15m with another speed of 40 km/h for the next 15m and then with the speed of 50 km/ h in the next 30m find the average speed of the train

Answer 1

Answer:

42.5 km/h is its average speed

Explanation:

h denotes hour here.

(30 km/h * 15/60 h) + (40 km/h * 15/60 h) + (50 km/h * 30/60 h)

=7.5 km + 10 km + 25 km

=42.5 km is the total distance travelled.

Now,

Average speed = Total distance/Time taken

=42.5 km / (15 minutes + 15 minutes + 30 minutes)

=42.5 km / 1 h

=42.5 km/h

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