Question

a car travelled at an average speed of 60 kmph for 4 hours and then at an average speed of 90 kmph for 2 hours
what was its average speed for whole joirney​

Answer 1

Answer:

Step-by-step explanation:Let the distance between P to Q be x

Time taken in going from P to Q =  

60

x

​  

 

Time taken in going from Q to P =  

90

x

​  

 

⇒ Average speed of bus = Total Distance travelled ÷ Total time taken =  

60

x

​  

+  

90

x

​  

 

2x

​  

=72 km/hr

Answer 2

Answer:

Total Distance =40 km, of which 30 km covered in first hour, remaining 10 km covered in another hour

Av speed= 40/2= 20 km/hr

Or

2. Total distance= 40 km, 30 km in 1 hr, remaining 10 km in 2 hrs

Av speed = 40/3= 13.33333.. km/hr

Or

3. Total distance= 70 km, 30 km in first hr, 40 km in second hr

Av speed= 70/3= 23.3333.. km/hr