Michael drives to hospital in 30 minutes at certain speed & he doubles his speed while returning. Calculate the total time taken for the round trip Pick:
A) 30 minutes B) 20 minutes C) 45 minutes D) 60 minutes E) 40 minutes
s1 = d1/t1;   s2 = d2/t2   Speed = distance / time taken   In this case d1= d2   Total time = t1 + t2   t1 = 30 minutes &amp; t2 = 15 minutes (since speed is doubled over the same distance)   T= 30 + 15= 
<gadget id="calculator">30 + 15</gadget>
<output>45</output>
45 minutes   ANSWER: 45 minutes
<result>C</result>
Michael drives to hospital in 30 minutes at certain speed & he doubles his speed while returning. Calculate the total time taken for the round trip