A truck covers a distance of 384 km at a certain speed. If the speed is decreased by 16 km/h, it will take 2 hours more to covers the same distance. 75% of its original speed (in km/h) is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 48.
⇒ - = 2
⇒ 384 () = 2
⇒ x2 – 16 = 192 × 16
⇒ (x - 64)(x + 48) = 0
⇒ x = 64, -48
So, x = 64
75% of 64 = 48 km/h