Answers

2014-11-18T11:39:17+05:30
36 km  ------>  40 min
216 km ------>  ? min

 \frac{216}{36}*40 = 240 minutes = 4 hours.
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2014-11-18T15:25:43+05:30

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So using unitary method 

36 km is covered in 40 min
so 1 km is covered in 40/36 min
and therefore 
216 km is covered in 40 x 216/36 min = 240 min = 4 hr

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