Question

Question #e45ff

Answer 1

Here

Distance traveled in first phase `s_1=150"miles"`

time of journey in first phase `t_1=3hr`

Distance traveled in 2nd phase `s_2=0"miles"`

time of journey in 2nd phase `t_2=0.5hr`

Distance traveled in 3rd phase `s_3=100"miles"`

time of journey 3rd phase `t_3=1.50hr`

So average speed

`"Total distance traveled"/"Total time taken"`

`=(s_1+s_2+s_3)/(t_1+t_2+t_3)`

`=(150+0+100)/(3+0.5+1.5)"miles/hr"`

`=50"miles/hr"`