Question #e45ff

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Answer 1 · 2017-10-08T06:52:15

Here

Distance traveled in first phase $s_{1} = 150 miles$ $s_1=150"miles"$

time of journey in first phase $t_{1} = 3 h r$ $t_1=3hr$

Distance traveled in 2nd phase $s_{2} = 0 miles$ $s_2=0"miles"$

time of journey in 2nd phase $t_{2} = 0.5 h r$ $t_2=0.5hr$

Distance traveled in 3rd phase $s_{3} = 100 miles$ $s_3=100"miles"$

time of journey 3rd phase $t_{3} = 1.50 h r$ $t_3=1.50hr$

So average speed

$\frac{Total distance traveled}{Total time taken}$ $"Total distance traveled"/"Total time taken"$

$= \frac{s_{1} + s_{2} + s_{3}}{t_{1} + t_{2} + t_{3}}$ $=(s_1+s_2+s_3)/(t_1+t_2+t_3)$

$= \frac{150 + 0 + 100}{3 + 0.5 + 1.5} miles/hr$ $=(150+0+100)/(3+0.5+1.5)"miles/hr"$

$= 50 miles/hr$ $=50"miles/hr"$