Question

An object travels a distance of 40km with avg speed of 80km/h and then next 40km with avg speed of 40km/h. Find the avg speed with the total distance.​

Answer 1

Given that:

• An object travels a distance of 40 km with average speed of 80 km/h.
• And then next 40 km with average speed of 40 km/h.

We know that:

• Distance = Speed × Time
• Time = Distance/Speed
• Speed = Distance/Time

Finding the time:

When,

• Distance = 40 km
• Speed = 80 km/h

↠ Time = 40/80 h

↠ Time = 0.5 h

When,

• Distance = 40 km
• Speed = 40 km/h

↠ Time = 40/40 h

↠ Time = 1 h

Now,

• Total distance = 40 + 40 = 80 km
• Total time = 0.5 + 1 = 1.5 h

Finding the average speed:

Average speed = Total distance/Total time

↠ Average speed = 80/1.5

↠ Average speed = 53.33 (approx.)

Hence,

• The average speed of the object is 53.33 km/h.
• And the total distance is 80 km.

Answer 2

QUESTION-:

An object travels a distance of 40km with avg speed of 80km/h and then next 40km with avg speed of 40km/h. Find the avg speed with the total distance.​

EXPLANATION-:

We know that-:

$\leadsto \underline{\boxed{\bf\; \dag V_{(AVG)}=\frac{Total\;distance}{Total\;time}}}$

Calculating total distance-:

Total distance=40+40

Total distance=80 km

Now in the questions the time is not given but it can be calculated using the formula-:

$\leadsto \underline{\boxed{\bf\; \dag Time=\frac{Distance}{Speed}}}$

T₁=40/80

=>T₁=0.5 hr

T₂=40/40

=>T₂=1 hr

Calculating total time-:

Total time=0.5+1

Total time=1.5 hr  

Putting the value in the formula to get Average speed-:

Average speed=80/1.5

Average speed=53.33 m/s