Question

A train takes 2 hours less of same journey at 300 km it increase 5h

Answer 1

Answer:

Step-by-step explanation:

Let n be the usual speed, and n+5 be the faster speed. Then:

300/n=300/n+5 +2

300(n+5)=300n+2n²+10n

2n²+10n-1500=0

n²+5n-750=0

(n+30)(n-25)=0

n=25 km/h