2014 · Q121
A distance X km is covered by two different trains with velocity v (in km/h) and kv (in km/h) in y and y + 3 h. respectively. If y < 13, then k is less than
general-mental-abilityquantitative-aptitude
- A5/8
- B11/16
- C3/4
- D13/16
Explanation
X = vy = kv(y+3) gives k = y/(y+3), an increasing function, so y < 13 implies k < 13/16.