Question

A train travelling with the speed of 72km/h .what is it’s speed in m/s.calculate the distance travelled by an train in kilometre after 6 hours of journey

Answer 1

Answer:

Speed= 72 km/hr

To convert km/hr into m/sec we have to multiply the given number by 5/18

So, the answer to your question is

(72 × 5/18)

4 × 5 = 20m/sec

Explanation:

You must multiply 72 to 1000 because 1km=1000m

Then divide it to 3600 because 1h have 3600 seconds.i.e

72×1000÷3600=20 m\s

So,

72km\h=20m\s

Answer 2

$\huge{\underline{\sf{\blue{Find:\rightarrow}}}}$

• Speed in m/s
• Distance travel in 6hrs.

$\rule{170}2$

$\huge{\underline{\sf{\red{Given:\rightarrow}}}}$

• Speed [v]= 72km/h
• Time [t] = 6 hrs.

$\rule{170}2$

$\huge{\underline{\sf{\green{SoLution:\rightarrow}}}}$

• Firstly we will convert the speed into m/s.

we know, 1km= 1000m ; 1h= 3600 sec

 

$\sf {1km/h = \dfrac{1000}{3600}m/s = \dfrac{5}{8}m/s}$

$\sf{72km/h= \dfrac{5}{18}\times 72m/s}$

$\boxed{\sf{speed =20m/s }}$

 

• Now we will find the distance travelled in 6 hrs.

$\boxed {\sf{speed= \dfrac{distance }{time}}}$

$\sf{72 = \dfrac{s}{6}}$

$\sf{6 \times 72= s}\\\\\sf{s= 432km}$

$\rule{170}2$