A tiger is chasing its prey at a constant speed. It entire body passes a blade of grass in 1 second. It then runs above a fallen tree trunk that is 20 meters long in 5 seconds. What is the length of the tiger?	Options:
A) 6 m  B) 5 m  C) 4 m  D) 3 m  E) none of the above

Rationale: sol . let the length of the tiger be x metres and its speed be y m / sec . then , x / y = 1 ⇒ y = x ∴ ( x + 20 ) / 5 = x ⇔ x = 5 m . answer b
Answer: B