A person has to cover a distance of 100 km. If he increases his speed by 5 km/hr he reaches 1 hr early. Find his initial speed (in km/hr).
Answer & explanation
Correct answer: option 3
Let the initial speed = x km/hr
ATQ,
\(\frac{100}{x}-\frac{100}{x+5}=1\)
let x = 20 (by using option)
\(\frac{100}{20}-\frac{100 }{25}=1\)
5 – 4 = 1 (satisfied)
x = 20