Question

a bus travels first 100 KM with the speed of 50 km per hour and next 80 km with speed of 40 km per hour. calculate the average speed of bus

Answer 1

its 45km per hour,,,,,,,,,

Answer 2

Answer:

The average speed of bus is 45 km/h

Explanation:

Formula: $Time = \dfrac{Distance}{Time}$

A bus travels first 100 km with the speed of 50 km/h

Time taken by first route $T_1=\dfrac{100}{50}=2\text{ hours}$

Next 80 km with speed of 40 km/h

Time taken by second route $T_2=\dfrac{80}{40}=2\text{ hours}$

$\text{Average speed}=\dfrac{\text{Total distance}}{\text{Total time}}$

$\text{Total time}=T_1+T_2=2+2 = 4\ h$

$\text{Total Distance}=100+80=180\ km$

Substitute the value into formula to get average speed

$\text{Average speed}=\dfrac{180}{4}\Rightarrow 45\text{ km/h}$

Hence, The average speed of bus is 45 km/h