Question

A train travel the first 15 kilometre per hour at a uniform speed of 30 km per hour the next 75 kilometre at a uniform speed of 50 kilometre per hour at last 10 km at uniform is speed of 20 km per hour calculate average speed Wikipedia

Answer 1

total distance= 15+75+10=100km
total time=1/2+3/2+1/2=5/2
average speed= total distance/total time
100/5/2=100*2/5=40kmper hour answer