Question

a train travel at the speed of 50km/h for 30 min , 40km/h for next 15min and 60km/h for next 60min. What is the average speed of the train?​

Answer 1

Given,

• Speed (s1) = 50km/h
• Speed (s2)= 40km/h
• Speed (s3) = 60km/h
• Time = t1 = 30 min
• t2 =15min
• t3 = 60 min.

To Find:-

• Average speed of the train.

Formula used:-

Average speed = distance /time

Calculations:-

Distance (d1) = S1 / t1

$\frac{50}{30}$

=1.6km

Distance (d2) = s2/t2

$\frac{40}{15}$

=2.6km

Distance (d3) = s3/t3

$\frac{60}{60}$

=1km

Average speed of the

train = Total distance /Total time

Total distance:-

d1 + d2 + d3

=1.6+2.6+1

= 5.2 km

Total time:-

t1+t2+t3

=30+15+60

=105

Now,

$\frac{5.2}{105}$

= 1.02km/hr