Question

the distance between two station is 100 km . a train travels 50 km at a speed of 50 km /hr. how fast must the train travels the next next 50 km. average speed 60 km/ hr for whole journey​

Answer 1

Average speed = 60km/h

Time taken to cover 50 km = 1 h

Total Distance = 100

Average speed = Total distance/Total time

60 = 100/1+X

100/60 = 1+X

5/3 = 1+X

X = 5/3-1

X = 2/3

X = Time = 2/3 hours = 40 minutes

therefore, it have to travel 50 km in 40 minutes

= 50/40

= 5/4

= 1.25 km

So , the train have to travel at the speed of

1.25 km/minute

$....$

Answer 2

Answer:

s=75km/h

Step-by-step explanation:

d=st

average speed = total distance/total time

let speed in next 50km be s

60=(50+50)/(50/50) + (50/s)

60=100/(1+50/s)

60=100s/(s+50)

60(s+50)=100s

6(s+50)=10s

3(s+50)=5s

3s+150=5s

5s-3s=150

2s=150

s=75km/h