<PRE><B>Question 937531</B>
x = speed for last 2/3
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s = d/t
t = d/s
d = st
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distance for last 2/3:
d = 480 km
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total distance:
(2/3)d = 480
d = 480*3/2
d = 720 km
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distance for first 1/3:
720 - 480 = 240 km
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time for first 1/3:
t = 240/45
t = 5.33333333333 hr
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total time:
t = 720/54
t = 13.3333333333 hr
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time for last 2/3:
t = 13.3333333333 - 5.33333333333
t = 8 hr
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speed for last 2/3:
x = 480/8
x = 60 kph
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