A man can reach certain place in 50hours. If he reduces his speed by 1/10th, he goes 400km less in time. Find his speed?	Choose the correct answer:
A) 20km/hr  B) 30km/hr  C) 40km/hr  D) 80km/hr  E) 60km/hr
Let the speed be x km/hr   50x-50* 9/10 *x = 400   50x - 45x = 400   5x = 400   x = 80km/hr   Answer is 80km/hr
<result>D</result>
A man can reach certain place in 50hours. If he reduces his speed by 1/10th, he goes 400km less in time. Find his speed?