Question

a train travel 450 km in 5 hours how long will it take to travel 720 km​

Answer 1

Assuming the motion to be uniform i.e, non accelerating

then according to statement

train takes 5 hrs to cover 450 kms i.e, speed of train is

$Speed = \frac{Distance}{Time}$

$Speed =\frac{450}{5} = 90 km s^{-1}Speed=\frac{5}{450}$

$=\frac{90}{1}$

Hence speed of the train is 90 km/ sec

time it will take to cover 720 km is given by

$Time =\frac{Distance}{speed}$

$Time=\frac{720}{90} =8hrs$

=8hrs

Hence time taken to cover 720 km if Motion is non accelerating

Answer 2

Assuming the motion to be uniform i.e, non accelerating

then

according to statement

train takes 5 hrs to cover 450 kms

i.e, speed of train is

$Speed = \frac{Distance}{Time}$

$Speed =\frac{450}{5} = 90 km s^{-1}$

Hence speed of the train is 90 km/ sec

time it will take to cover 720 km is given  by

$Time =\frac{Distance}{speed}$

$Time=\frac{720}{90} =8hrs$

Hence time taken to cover 720 km if Motion is non accelerating