Question

a scooterist covers a distance of 3 km in 5 minutes calculate the average speed in (i) cm/s (ii) km/h (iii) m/s

Answer 1

Given:

• Distance travelled = 3 km

• Time taken = 5 minutes

To be calculated:

Calculate the average speed in (i) cm/s (ii) km/h (iii) m/s ?

Formula used:

$\boxed{ \sf{Speed = \frac{Distance }{Time} }}$

Solution:

( i ) We convert the given distance 3 kilometers into centimeters and given time 5 minutes into seconds .

Distance travelled = 3 km

= 3 × 1000 m

= 3000 × 100 cm

= 300000 cm

Time taken = 5 minutes

= 5 × 60 seconds

= 300 seconds

Now,

Speed = Distance/Time

= 300000 cm / 300 sec

= 1000 cm/s

( ii ) We convert given time 5 minutes into hours.

Distance travelled = 3 km

Time taken = 5 minutes

= 5/60 hrs

= 0.083 h

Now,

Speed = Distance/Time

= 3 km / 0.083 h

= 36 km/h

( iii ) We convert the given distance 3 kilometers into meters and given time 5 minutes into seconds .

Distance travelled = 3 km

= 3 × 1000 m

= 3000 m

Time taken = 5 minutes

= 5 × 60 seconds

= 300 seconds

Now,

Speed = Distance/Time

= 3000 m / 300 s

= 10 m/s