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?  Choices
A) 6 m  B) 5 m  C) 4 m  D) 3 m  E) None of the above
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 5 m
<result>B</result>
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?