A person can walk at a constant rate of 8mph and can bike at a rate of 16mph. If he wants to travel 64 miles in 8 hours using bike and walking at their constant rates, how much distance would he require to walk?  Choose the correct choice from the following answers:	A) 20	B) 30	C) 48	D) 64	E) 72
Total distance = 64   64istance = Speed * Time   Walking speed = s1 = 8   Walking time = t1   Bike speed = s2 = 16   Time traveled in bike = t2   d1 + d2 = 64   s1t1 + s2t2 = 64   8*t1 + 16*t2 = 64   t1 + 2*t2 = 8 ----- (1)   Given: t1 + t2 = 8 ----- (2)   (1) - (2) --&gt; t2 = 0 and t1 = 8 - 0= 
<gadget id="calculator">8 - 0</gadget>
<output>8</output>
8   Walking distance= s1*t1 = 8*8= 
<gadget id="calculator">8*8</gadget>
<output>64</output>
64   Answer: 64
<result>D</result>
A person can walk at a constant rate of 8mph and can bike at a rate of 16mph. If he wants to travel 64 miles in 8 hours using bike and walking at their constant rates, how much distance would he require to walk?