Question

A body covers total distance z such that first one fourth of distance of z with the speed of 10 km/h, second one fourth of distance z with the speed 20 km/h, third one fourth of distance z with the speed of 30km/h and last one fourth of distance z with the speed 40 km/h. find the average speed of body​

Answer 1

time taken is t
t=
V
1
​

3
x
​

​
+
V
2
​

3
2x
​

​

average speed is v=
t
x
​


V
avg
​
=
3v
1
​

x
​
+
3V
2
​

2x
​

x
​
=
V
2
​
+2V
1
​

3V
1
​
V
2
​

​

Answer 2

Explanation:

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