Question

A train travels 700 meters in 35 seconds what is its speed in km per hour ​

Answer 1

Answer:

speed =distance\time = 700/35 =20 m/s

Answer 2

Solution:-

Given :

Distance = 700 meters

Time = 35 seconds

To Find :

• Speed in km/hour

Formula :

Speed = Distance/Time

Let us firstly change the time from seconds to hours :

Time = 35 seconds = 35/3600 = 7/720 hours

[ 1 second = 1/3600 hours ]

Now let us change the distance from meters to kilometers :

Distance = 700 meters = 700/1000 = 0.7 km

[ 1 m = 1/1000 km ]

Now let us find the Speed :

Speed = 0.7/(7/720)

= (0.7 × 720)/7

= 504/7

= 72 km/hour

Hence, Speed = 72 km/hour

We can also do the following question by this method :-

Speed = Distance/Time

= 700/35

= 20 m/sec

Let us now change it into km/hour :-

Speed = 20 m/sec

= 20 × 18/5

= 4 × 18

= 72 km/hour

Or

Speed = (20 × 60 × 60)/1000

= 2 × 6 × 6

= 12 × 6

= 72 km/hour