Question

aeroplane cover to 2500 kilometre 1200 km and 500 kilometre at the rate of 500 kilometre per hour for 100 kilometre per hour and 250 kilometre per hour respectively find its average speed for the whole journey​

Answer 1

I) 2500/500=5hrs

2) 1200/100 = 12hrs

3) 500/250=2hrs

Total distance = 4200 kms

total hrs = 19 hrs

Average speed = 4200 / 19=221 km/hr. Ans