Answers

2014-07-18T16:50:34+08:00
240 km ÷ 3 hr = 80 km/hr
400 km ÷ 80 km/hr  = 5 hrs. ⇒ Ans.
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2014-07-18T17:53:20+08:00
Let X be the kph (kilometer per hour)

3x (3 hours)
3x=240
3x/3 = 240/3
x=80

the motorist travel 80kph ..
then ... 
400/80 = 5 hours

answer : 5 hrs
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