Question

A train travel the first 15 km at a uniform speed of 30 km/h the next 75 km at a uniform speed of 50km/h and the last 10km at a uniform speed of 20 km/h calculate the average speed for the entire train journey​

Answer 1

Answer:

Step-by-step explanation:

40 km\h

d1=15km s1=30km\h

d2=10km s2=20km\h

d3=75km s3=50km\h

total time taken=t1+t2+t3

=0.5+0.5+1.5=2.5

speed =distance\time

100\2.5=40km\h

Answer 2

Step-by-step explanation:

40km.

D1=15Km S1=30Km/h

D2=10Km S2=20Km/h

D3=75Km S3=50Km/h

Total Time Taken = T1+T2+T3=0.5+0.5+1.5=2.5

Speed=Distance/Time

100/2.5=40Km/h