John covered a part of his journey at 20km/h and the remaining part at 70 km/h. He took a total of 8h to cover a distance of 400km. Work out how much time did he travel at 20 km/h.
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let see d/t =v then x/20 + (400-x)/70 =8
x= 64 kmh
t = 64/20 = 3.2 h
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