Question

ali works in an office in the town center.he lives 3 km away.in the mornings he can walk to work in 30 minutes.if he cycle,his journey takes only 20 minutes.what is his average speed when walking to work?

Answer 1

We convert the kms to meters.

3 × 1000 = 3000m

Convert the minutes to seconds.

30 × 60 = 1800 seconds.

Speed = Distance ÷ time

3000 / 1800 = 1.667 m / s

Answer 2

Answer:

The average speed = $\frac{total\quad distance\quad travelled\quad by\quad the\quad body} { total\quad time}$

Total distance traveled by the ali = 3 + 3 =6km

Total time for the journey by only by walking = 30 + 30= 60min= 1 hour

Average speed $=\frac{ 6 km }{ 1 hr} = 6 km/ hr = \frac{6000 meter}{3600 secs} = 1.7 m/secs$

Therefore, the average speed of ali taken to walk  is 1.7 m/secs.