Register
7. A car travels a certain distance with a speed of 50 km/h and returns with a speed of 40 km/h. Calculate the average speed Plz help
80.0k views
4 votes
7. A car travels a certain distance with a speed of

50 km/h and returns with a speed of 40 km/h.
Calculate the average speed
Plz help

User Lordjeb
by
7.7k points

1 Answer

3 votes
Let distance be x.

Time in going, t 1 = x/50

Time in coming, t 2 = x/40

Total time T = x/40 +x/50 = 9x/200

Average speed = total distance/ total time

=( x+x)/(9x/200)= 2x ×200/9x = 400/9 = 44.44 km/h
User Shevonne
by
7.0k points
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

8.8m questions

11.4m answers

Other Questions

Physical properties of minerals graphic organizer
A snowball is launched horizontally from the top of a building at v = 16.9 m/s. If it lands d = 44 meters from the bottom, how high (in m) was the building?
What type of rock is the Haystack rock (igneous, Metamorphic, or Sedimentary)
what is a device that transforms thermal energy to mechanical energy
How many light sources do you know Pls list them
Link Copied!