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Question

Jones covered a distance of 50 km on his first trip,On a later trip he traveled 300 km while going three times as fast. His new time compared with the old time was:

A
three times as much
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B
twice as much
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C
the same
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D
half as much
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E
a third as much
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Solution

The correct option is D twice as much
Let old time taken = t
Old speed = v
vt=50t=50v
New speed = 3 (old speed) = 3v
Let new time = T
3vT=300T=100v=2t
New time = 2 (old time)

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