Question

A scooterist covers a distance of 3km/h in 5mins. Calculate his Speed in km/h.

Answer 1

Answer:

0.6

Explanation:

speed equals distance by time (d/t). hence if we substitute the values, it's 3/5 which is nothing but 0.6

Answer 2

Answer:

Solution : 

(a) In order to calculate the speed in centimetres per second we should convert the given distance of 3 kilometres into centimetres and the given time of 5 minutes into seconds. Pleas note that 1 kilometre has 1000 metres and 1 metre has 100 centimetres. Now, 

Distance travelled = 3 km 

 =3×1000=3×1000m 

 =3×1000×100=3×1000×100 cm  ...(1)...(1) 

  = 300,000 cm 

Time taken = 5 minutes 

 =5×60=5×60 seconds 

 =300s  ...(2)...(2) ltBrgt We know that,   Speed = Distance travelledTime takenDistance travelledTime taken 

 =300,000300s=300,000300s 

  = 1000 cm/s  ...(3)...(3) 

Thus, the speed of scooterist is 1000 centimetres per second. 

(b) In order to express the speed in metres per second we should convert the given 3 kilometres into metres and the given time of 5 minutes into seconds. Thusk, in this case : 

Distance travelled = 3km 

 =3×1000=3×1000 m 

 =3000=3000 m  ...(4)...(4) 

Time taken = 5 minutes 

 =5×60=5×60 seconds 

  = 300 s  ...(5)...(5) 

Now,   Speed = Distance travelledTime takenDistance travelledTime taken 

 =3000m300s=3000m300s