A man walks at a speed of √x km/hr. After 2 hours, he has covered the same number of kilometers as the value of x. What is the value of x?
Show answer & explanation
Correct answer: A
Explanation
Speed = √x km/h
Time = 2 hours
Distance = x km
x = √x × 2
x = 2√x
x² = 4x
x(x − 4) = 0
x = 4