Question

a car goes from A to B at a speed of 40 km/hr. And come back due to less traffic at a speed of 60 km/hr. Calculate the average speed and average velocity?

Answer 1

average speed =2 km/hr

Answer 2

If a motorist travels from a to b at a speed of 40km/hr and returns at speed of 60km/hr, what is his average speed?

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10 ANSWERS



Neeraj Dhiman, I can solve speed problems





Average speed = Total Distance / Total Time Taken

But we have only speeds S1 and S2

S1 = 40 km/hr

S2 = 60 km/hr

So now let us assume that the distance between a and b will be 120 km ( LCM of 40 and 60 )

D1 = 120 km

D2 = 120 km

Total Distance = D1 + D2 = 120 + 120 = 240 km

Now

T1 = D1/S1

T1 = 120/40 = 3 hr

T2 = D2/S2

T2 = 120/60 = 2 hr

Total Time = T1 + T2 = 3 + 2 = 5 hr

Now

Average Speed = Total Distance / Total Time = 240 / 5

Average Speed = 48 km/hr