Question

an aeroplane left 40 minutes late due to heavy rain and in order to reach its destination 1600 kilometre away it in time it had to increase its speed by 400 km per hour for its original speed find the original speed of the aeroplane ​

Answer 1

Answer:

800

Step-by-step explanation:

Let usual speed was X kmph, then new speed will be (X+400)kmph.

Time taken to cover 1600 km with speed X kmph,

= 1600/X

Time taken to cover 1600 km with Speed (X +400) kmph,

= 1600/(X+400)

Now,

Time difference = 40 minutes.

(1600/X)- (1600/(X+400)) = 40/60 hours

X² +400X - 960000 = 0

On solving,

X = -1200, 800.

Speed cannot be negative, So usual speed will be 800 km per hour.

Answer 2

Answer:

I don't know. sorry about that.