Question

Step-by-step explanation:

A plane left 30 minutes late than its scheduled time and in order to reach the destination 1500 km away in time, it had to increase its speed by 100 km/h from the usual speed. Find its usual speed.


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.


Find the question :-]]

Answer 1

Answer:

Qstn that u have asked:

A plane left 30minutes late than it's schedule time and in order to reach the destination 1500km away in time, it had to increase it's speed by 100km/h from the usual speed . Find it's usual speed.

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