Question

An aeroplane covers 2500 km ,1200 km and 500 km at the rate of 500 km/hr 400km/hr and 250 km / hr respectively. Find its average speed for the whole journey

Answer 1

Answer:

2500/500=5hrs

1200/400=3hrs

500/250-2hrs

Total distance-4200 km

time=10hrs

Av.speed-4200/10=420 Km/hr

Answer 2

Answer:

420km/hr

Step-by-step explanation:

Total distance=2500+1200+500=4200km

T=D/S

T=2500/500=5hr

T=1200/400=3hr

T=500/250=2hr

=4200/5+3+2

=4200/10

=420km/hr