Question

A man covers half of his journey at 6km/hr and the remain half 3km/hr.its avrg spd is?plz help

Answer 1

Let the speed of the half of his journey x = 6km/hr.

Let the speed of the remaining journey y = 3km/hr.

When two speeds are given, we have to use the following formula:

= > Average speed = 2xy/x + y

= > 2(6)(3)/(6 + 3)

= > 36/9

= > 4.

Therefore, Average speed = 4km/hr.

Hope this helps!

Answer 2

Answer:

Step-by-step explanation:

Let total distance be 2x km.

So,at 6km/h,man travels x km.

At 3km/h,he travels x km only.

Man travels 6km/h in (x/6) hrs (Speed=Distance/Time)

He travels 3km/h in (x/3) hrs.

Average speed=Total distance/Total time

=2x/((x/6)+(x/3))

=4 km/h

Hope you understood