SOLUTION: Mr Ho drove a speed of 60km/h during the first 5/12 of his journey to his office. He completed the rest of his journey in 10 minutes at a speed of 84km/h.How much time did he spend
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Question 814264: Mr Ho drove a speed of 60km/h during the first 5/12 of his journey to his office. He completed the rest of his journey in 10 minutes at a speed of 84km/h.How much time did he spend on the entire journey? Answer by TimothyLamb(4379) (Show Source):
You can put this solution on YOUR website! D = ?
s = d / t
d = s * t
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2nd half:
d = s * t
d = 84 km/h * 10 min * (1/60) h/min = 14 km
D(1 - 5/12) = 14
D(12/12 - 5/12) = 14
D(7/12) = 14
D = 14(12/7)
D = 24
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1st half:
d = D - 14 = 24 - 14 = 10 km
t = d / s
t = 10/60 hours
t = 10/60 hours * 60 min/hr = 10 min
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Answer:
total time = 10 + 10 = 20 min
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