Question

$) A bus has a speed of 36 km/h. How long will
il Jake to cover a
a distance of 500 m ?​

Answer 1

Answer:

50 seconds

Step-by-step explanation:

The important concept required here is conversion of Km/hr into m/s to get the answer.

1 Km/hr=1000/(60*60) meter/seconds

= 5/18 m/s.

Thus,

1 Km/hr= 5/18 m/sec

then

36 Km/hr=x m/s.

Therefore by taking famous cross multiplication,

(x)*1=36*(5/18)

This is why we multiply the value in Km/hr with 5/18 to get it into m/sec.

thus x=10 m/s.

and the distance is 500 m.

thus using speed=distance/time,

time=distance/speed,

thus time required will be,

500/10 sec =50 seconds.

2nd example

Here we shall apply the Unitary Method .

The speed of the bus is 36 km per h

That means 36 × 1000 m are covered in 1h or 3600s

or 36000m are covered by the bus in 3600s

or 1m is covered by the bus in 3600/ 36000s

or 500m are covered in 3600 / 36000 × 500

or 50s

Hence the bus travels a distance of 500m in 50s , which is the required answer.

3rd example

The bus covers 36 km in one hour

therefore it takes 1/36 hours to cover one kilometer

which is 0.0277 hours

which is 100 seconds

therefore it would take half the time to cover 500 meters as it is half of a kilometer

therefore it takes 50 seconds to cover 500 meters.

4th example

Since km/h / 3.6 = m/s,

36 km/h = 10 m/s.

500/10 = 50, so it takes 50 seconds to travel 500 meters at the speed of 36 km/h.

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