Johan covers a past of a journey at 20km/h and remaining at 70km/h taking a total of 8 hr to cover the distance of 400 km how many hours has he been driving at 20 km / h

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Johan covers a past of a journey at 20km/h and remaining at 70km/h taking a total of 8 hr to cover the distance of 400 km how many hours has he been driving at 20 km / h

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Johan covers a past of a journey at 20km/h and remaining at 70km/h ta...

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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