During first half of a journey by a body it travel with a speed of 40km/hr and in the next half it travels with a speed of 20 km/hr .Calculate the average speed of the whole journey.

Average speed = 26.67 km/h

Explanation:

It is given that,

The first half of the journey by a body is traveled with a speed of 40 km/h and the next half is covered with a speed of 20 km/h

We need to find the average speed of the whole journey. When two speeds are given, the average speed is given by :

So, the average speed of the body of the whole journey is 26.67 km/h.

answer: a) y=-8x+5

a) m= -8

b) m= -2

c) m= 7

d) m= 6

v 154.9= 0.9 length length s little over 154.9cm