2017
Mathematics
JAMB
A man covered a distance of 50 miles on his first trip, on a later trip he traveled 300 miles while going 3 times as fast. His new time compared with the old distance was?
A.
three times as much
B.
the same
C.
twice as much
D.
half as much
Correct Answer: twice as much
Explanation
Let the speed of the 1st trip be x miles/hr and the speed of the 2nd trip be 3x miles/hr Speed = distance/time ∴ Time taken to cover a distance of 50 miles on the 1st trip = 50/xhr time taken to cover a distance of 300 miles on the next trip = 300/3xhr = 100/xhr ∴the new time compared with the old time is twice as much
Let the speed of the 1st trip be x miles/hr and the speed of the 2nd trip be 3x miles/hr Speed = distance/time ∴ Time taken to cover a distance of 50 miles on the 1st trip = 50/xhr time taken to cover a distance of 300 miles on the next trip = 300/3xhr = 100/xhr ∴the new time compared with the old time is twice as muchTHIS WEEK's
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