John covers a part of the journey at 20km/he and the remaining at 70km/he, taking total of 8 hours to cover the distance of 400 km.How many hours he has been driving at 20km/hr
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Explanation:
Let the first part of the journey is covered in x hours and balance in y hours
Total distance travelled = 20x + 70y
=> 20x + 70y = 400 ...(1)
Total time = 8 hr
=> x + y = 8 ...(2)
Solving (1) and (2)
(2)×70-(1)=> 50x = 70×8-400
50x = 160
x = 160/50 = 3.2 hour
Required time = 3.2 hours
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