Question

A train covers a distance of 670 km in 6h 5min . If it covers the first 390km of the journey at 90 km/h, find its speed for the rest of the journey.​

Answer 1

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journy at 90km /hour =390/90

4 hours 20 minutes

covers the rest journey =670-390

= 280km

time taken to travel 280km =

6h 5m in minutes = 365 minutes

4h20 minutes in minutes = 260 minutes

time taken to cover 280km = 365 -260

=105 minutes

105 minutes in hour =

1 h 45 minutes

Avarage speed = Total distance traveled / Total time taken

280km/1h 45 minutes

change into metre and minutes

280000/105

= 2666.66m per minute

2.666km per minute

per hour =2.666x60

= 160 km /h