Question

A train runs for 3 hours at a speed of 55 km per hour and for the next 2 hours at a speed of 65 km per hour. find the average speed of the train for the 5 hours journey

Answer 1

assume that
t1=3h
v1=55km/h
t2=2h
v2=65km/h
we know ,
average velocity=(s1+s2)÷t=(v1×t2×v2×t2)÷t
here given,t=5h
v=(3×55+2×65)÷5=59km/h