Question

A car travels 40km at a uniform speed of 60 km/hr and next 50ķm at a uniform speed of 80 km/hr . Find the average speed ?

Answer 1

Distance = 40km

Speed = 60km/hr

Time = Distance/time

=> 40/60

=>2/3hrs

Distance = 50km

Speed = 80km/hr

Time = Distance/speed

=> 50/80

=>5/8hr

Total Distance = 40+50 = 90km

Total time = 2/3+5/8 = 31/24hrs

Average speed = Total Distance/Total time

=>90÷(31/24)

=>(90×24)/31

=>69.68km/hr

So,

The average speed is 69.68km/hr ~70km/hr

Cheers!