A man rides at the rate of 50km/hr. But stops 30minutes to change horses at the end of every 25th kilometer. How long will he take to go a distance of 250 kilometers?  Choose the correct choice from the following:
A) 5hr
B) 6hr 30min
C) 8hr 10min
D) 7hr 20min
E) 8hr
speed of man = 50km/hr   number of rests = (250/25)-1= 
<gadget id="calculator">(250/25)-1</gadget>
<output>9</output>
9   time taken for the man= (250/50)+9*(20/60)= 
<gadget id="calculator">(250/50)+9*(20/60)</gadget>
<output>8</output>
8 hr   Answer is 8hr
<result>E</result>
A man rides at the rate of 50km/hr. But stops 30minutes to change horses at the end of every 25th kilometer. How long will he take to go a distance of 250 kilometers?