Due to inclement weather, an air plane reduced its speed

Due to inclement weather, an air plane reduced its speed by 300 km/hr, and reached the destination of 1200 km late by 2hrs. Then the schedule duration of the flight was

Let the original speed of aeroplane be x kmph.
According to the question,

1200	−	1200	= 2
x − 300		x

⇒ 1200		x − x + 300		= 2
		x(x − 300)

⇒ x (x – 300) =	1200 × 300
	2

⇒ x (x – 300) = 600 × 300
⇒ x (x – 300) = 600 (600 – 300)
⇒ x = 600 kmph.

∴ Scheduled duration of flight =	1200	= 2 hours
	600