Question

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

Answer 1

Answer:

hi here is ur answer

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

3.8

may be it helps you