Question

A train travels 120 km in 2 hours and 30 minutes. What is the average speed?

Answer 1

$\fbox{\fbox{ \bold{ \large{ \: \: Given \: \: }}}}$

$\to$ Distance = 120 km = 120000 meter

$\to$ Time = 2 hr and 30 min = 150 min = 9000 sec

$\fbox{\fbox{ \bold{ \large{ \: \: To \: Find \: \: }}}}$

$\to$ Average Speed = ?

$\fbox{\fbox{ \bold{ \large{ \: \: Solution \: \: }}}}$

${\bold{ \underline{ \: we \: know \: that \: , \: \: }}}$

$</p><p> \fbox{\large{\bold{Average \: speed \: = \frac{ \: Total \: distance \: }{ \: Total \: time \: } }}}$

$\bold{Average \: speed = \frac{120000}{9000} }\\ \\ \bold{ Average \: speed = 13.33333333} \: \: \bold{m/s}$

Answer 2

Given:

Train travels 120 km in 2 hours and 30 minutes.

To find:

Average speed of train ?

Calculation:

• Average Speed is defined as the ratio of total distance to the total time taken by the object.

• Now, 2 hours + 30 minutes means 2 hours + ½ hours = 2.5 hours.

$\therefore \: avg. \: v = \dfrac{total \: distance}{total \: time}$

$\implies \: avg. \: v = \dfrac{120}{2.5}$

$\implies \: avg. \: v = 48 \: km/hr$

So, average speed of train is 48 km/hr.