An aeroplane covers a distance of 1500km in a certain time at a certain speed. After increasing the speed by 100km/hr, it covers the same distance in a time which is half an hour less than the previous time. Find the previous speed of the aeroplane. this is from quadratic equations CBSE grade 10
please answer ASAP

previous speed of the aeroplane is 500 km/hr

Step-by-step explanation:

Given: Distance covered by  aeroplane = 1500 km

It covers the same distance in a time which is half an hour less than the previous time if the speed is increased by 100 km/hr

To find: previous speed of the aeroplane

Solution:

Let x denotes the previous speed of the aeroplane.

Time taken by an aeroplane if speed is x km/hr = distance/speed = hours

If speed is increased by 100 km/hr, new speed = (x + 100) km/hr

Time taken by an aeroplane if speed is (x + 100) km/hr = hours

According to question,

As speed can not be negative, is rejected.

So,

previous speed of the aeroplane is 500 km/hr

360/29

step-by-step explanation:

the correct answer is $7.38

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