Question

A train covers the first 60 kilometre of its journey speed of 80 kilometre per hour the next 90 kilometre at the speed of 100 kilometre per hour and the rest of it 330 km journey at the speed of 120 kilometre per hour find the total time taken to complete it's journey.Also find its average speed.​

Answer 1

Step-by-step explanation:

In 1st journey time taken = d/s

= 60/80 hr

= 0.75 hr

In 2nd journey time taken = d/s

= 90/100

= 0.9 hr

In 3rd journey time taken = d/s

= 330/120

= 2.75 hr

Then total time taken = 0.75 + 0.9 + 2.75 hr

= 4.4 hr

Now, average

Sum all speed = 60 + 90 + 330 = 480 km/hr

Number of observation = 3

Then, average = 480/3 = 160 km/hr

Hence, the total time taken to complete it's journey is 4.4 hr

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Answer 2

Answer:

Step-by-step explanation: