Question

while driving to school computes the average speed for his trip to be 20 km on his return trip along the same route there is less traffic and average speed is 30 kilometre what is the average speed for a trip?

hi ​

Answer 1

Answer:

The average speed when travelling to school = 20km/hr

Average speed when travelling from school = 30km/hr

Let the distance be x km.

Speed = Distance/ Time

Time = Distance/ Speed

When travelling to school:

t₁ = x/20

When travelling from school:

t₂ = x/30

Average speed = Total distance/ Total time

=> $\frac{x + x}{\frac{x}{20} + \frac{x}{30} }$

=> $\frac{2x}{\frac{3x+2x}{60} }$

=> $\frac{2x}{\frac{5x}{60} }$

=> $\frac{2x}{\frac{x}{12}}$

=> 24km/hr

∴ Average speed for the trip is 24km/hr.

Answer 2

Answer:

Explanation:

The average speed when travelling to school = 20km/hr

Average speed when travelling from school = 30km/hr

Let the distance be x km.

Speed = Distance/ Time

Time = Distance/ Speed

When travelling to school:

t₁ = x/20

When travelling from school:

t₂ = x/30

Average speed = Total distance/ Total time

iske baad mujhe nhi aata xD