Question

One third of a certain journey was covered at the speed of 20 km. / hr. One-fourth at 30 km. /hr. And the rest at the speed of 50 km. /hr. The average speed per hour for the hole journey is

Answer 1

30km/he is the Average speed of the journey.

Answer 2

Answer:

30 km/h

Step-by-step explanation:

let,

total distance X km

so,

X/3 = 20t(1)

X/4= 30t(2)

(1-x/3-x/4)=50t(3)

we know ,

average speed = (X/t)

by solving equations

we get 30km/h