Question

A bus travels first 150 km with a speed of 30 km/h
and next 60 km with a speed of 40 km/h. What is the average
speed of the bus during the entire journey ?

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Answer 1

Step-by-step explanation:

We know that, Speed = Distance / Time

So, time taken to travel first 150 km, t1 = Distance / Speed = 150 / 30 = 5 h

Time taken to travel next 60 km, t2 = Distance / Speed = 60 / 40 = 1.5 h

Total distance travelled = 210 km

Total time taken = t1 + t2 = 5 + 1.5 = 6.5 h

So, average speed = Total distance / Total time = 210 / 6.5 = 32.308 km/h

Answer 2

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$\bold{Explanation:}$

We know that, Speed = Distance / Time

So, time taken to travel first 150 km, t1 = Distance / Speed = 150 / 30 = 5 h

Time taken to travel next 60 km, t2 = Distance / Speed = 60 / 40 = 1.5 h

Total distance travelled = 210 km

Total time taken = t1 + t2 = 5 + 1.5 = 6.5 h

So, average speed = Total distance / Total time = 210 / 6.5 = 32.308 km/h