Math, asked by mona1212, 1 year ago

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

Answers

Answered by 0tohero

I THINK 500KM/H.......

Panwadi: _500 and 600 km

0tohero: what

devu26: correct answer

mona1212: I want you, to solve this for me..... Can you plzz, its quite confusing

Panwadi: Yup

devu26: let the usual speed be x... distance =1500km, according to question 1500/x -1500/x+100 =1/2 then solved

mona1212: Ohhh, ohk ohkk...... Thankqq so much.... I got it.......... Really thanks it means a lot

Answered by TheBrainliestUser

Let the original speed of train be x km/hr

New speed = (x + 100) km/hr

We know that,

Time = Distance / Speed

Given : A plane left 30 minutes or 1/2 hours later than the scheduled time.

According to the question,

=> 1500/x - 1500/(x + 100) = 1/2

=> (1500x + 15000 - 1500x)/x(x + 100) = 1/2

=> 2(15000) = x(x + 100)

=> 30000 = x² + 100x

=> x² + 100x - 30000 = 0

=> x² + 600x - 500x - 30000 = 0

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

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

=> x = 500 or x = - 600

∴ x ≠ - 600 (Because speed can't be negative)

Hence,

Its usual speed = 500 km/hr

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