Question

A car travels first 5 km at 20 km/h and the next 5 km at 30 km/h. What is its average speed?

Answer 1

Answer:

24km/h

Explanation:

Average speed = 2V1V2/V1+v2

= 2*20*30/20+30

= 24km/h

Answer 2

Answer:

24 km $h^{-1}$

Explanation:

average speed = $\frac{sum. of. distance}{sum of time taken}$

or

avg.speed=$\frac{5+5}{\frac{dist._{1} }{speed_{1} }+\frac{dist._{2} }{speed_{2} } }$

=>avg.speed=$\frac{10}{\frac{1}{4}+\frac{1}{6} }$

=>avg.speed=$\frac{10}{\frac{5}{12} }$

=> $\frac{10}{5} *12$

=>24 km $h^{-1}$