A cat chases a rat 6 hours after the rat runs. cat takes 4 hours to reach the rat. If the average speed of the cat is 90 kmph, what s the average speed of the rat?
Options:	A) 32 kmph	B) 26 kmph	C) 35 kmph	D) 36 kmph	E) 32 kmph

Rationale: cat take 10 hours and rat take 4 hours . . . then distance chased by them is 90 * 4 . so speed of rat is ( 90 * 4 ) / 10 = 36 kmph . answer is d
Answer: D