Question

plz solve this it's urgent give explanation

for 4 mrks​

Answer 1

Answer:

Let the usual speed of the plane = x km/hr

Distance to the destination = 1500 km

Increased speed = 100 km/hr

So, according to the question

1500/x - 1500(x+100) = 30/60

x2 + 100x - 300000 = 0

x2 + 600x - 500x - 300000 = 0

(x + 600)(x - 500) = 0

x = -600 or 500

Since, speed can not be negative, x = 500

Usual speed of plane is 500 km/hr.

Answer 2

Answer:

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