Question

with a constant speed of 80 km/hr. What was her average speed?
15. An aeroplane travels distances of 2500 km, 1200 km and 500 km at the rate of 500 km/hr,
400 km/hr and 250 km/h respectively. Find the average speed of the plane.
For a race Manish ran at a speed of 6 me for​

Answer 1

Answer:

420km/hr

Explanation:

time=distance/speed

time=2500/500+1200/400+500/250

5+3+2=10 hrs

speed=total distance/time

(2500+1200+500)/10

4200/10=420 km/h(ans)

Total time taken by the aeroplane = (2500/500)+(1200/400)+(500/250) hrs

=5+3+2 hrs =10 hrs.

Also total distance travelled = 2500+1200+500 kms

=4200 kms.

So, avg. speed = 4200/10 km/hr

=420 km/hr

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