Question

x^2+240x-1800=0
plz help and solve this quickly​

Answer 1

Answer:

Step-by-step explanation:Let the original speed of he train be x km/hr.

Time taken at original speed= 360/x hrs

Time taken at increased speed= 360/x+5 hrs

Now,

360/x - 360/x+5 = 48/60

=> 360[1/x - 1/x+5] =4/5

=> x²+5x-2250=0

=> x=45 or -50 (as speed cannot be negative)

=>x=45 km/hr.