Question

A train is running at a speed of 72 km/hr, how far will it go in 7 seconds?​

Answer 1

Answer:140 meter

Step-by-step explanation:

D=T×S

=7×72×5/18

=7×20

=140 meter

Answer 2

The train will go 140 meter in 7 seconds

Given :

A train is running at a speed of 72 km/hr

To find :

The distance travelled by the train in 7 seconds

Solution :

Step 1 of 2 :

Express speed of the train in meter/sec

Here it is given that train is running at a speed of 72 km/hr

1 km = 1000 meter

∴ 72 km = 72000 meter

Also , 1 hour = 3600 seconds

Thus we get

$\displaystyle \sf{ 72 \: km/hr}$

$\displaystyle \sf{ = \frac{72000}{3600} \: \: meter/sec}$

$\displaystyle \sf{ = 20 \: \: meter/sec}$

Step 2 of 2 :

Calculate distance travelled by the train in 7 seconds

The speed of the train = 20 meter/sec

∴ The distance travelled by the train in 1 second = 20 meter

Hence the distance travelled by the train in 7 seconds

= (20 × 7) meter

= 140 meter

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