A person can walk at a constant rate of 8mph and can bike at a rate of 16mph. If he wants to travel 88 miles in 8 hours using bike and walking at their constant rates, how much distance would he require to walk?
Answers
A) 20
B) 30
C) 40
D) 60
E) 72
Total distance = 88   Distance = Speed * Time   Walking speed = s1 = 8   Walking time = t1   Bike speed = s2 = 16   Time traveled in bike = t2   d1 + d2 = 88   s1t1 + s2t2 = 88   8*t1 + 16*t2 = 88   t1 + 2*t2 = 11 ----- (1)   Given: t1 + t2 = 8 ----- (2)   (1) - (2) --&gt; t2 = 3 and t1 = 8 - 3= 
<gadget id="calculator">8 - 3</gadget>
<output>5</output>
5   Walking distance= s1*t1 = 8*5= 
<gadget id="calculator">8*5</gadget>
<output>40</output>
40   Answer: 40
<result>C</result>
A person can walk at a constant rate of 8mph and can bike at a rate of 16mph. If he wants to travel 88 miles in 8 hours using bike and walking at their constant rates, how much distance would he require to walk?