Question

on a track a train travels the first 30km at a uniform speed of 30km/h. calculate the speed with which the train should move rest of thr track so as to average 60km/h for the entire trip




the measurement of the track is not mentioned...

please someone help me with this..

step by step explanation pleasee​

Answer 1

Answer:

Let the speed of the train for next 30 km be "x".

Since, t=

s

d

So, time taken by the train for first 30 km,

t

1

=

30km/h

30km

=1h

Time taken by the train to travel next 30 km:

t

2

=

xkm/h

30km

=(30/x)h

Time taken for the entire trip:

t=

4km/h

60km

=1.5h

So, 1+

x

30

=1.5

⇒x=60km/h

Answer 2

Answer:

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