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
• B. twice as much
• C. the same
• D. half as much
• E. a third as much

Answer 1

Answer: (B)

twice as much

Let old time taken = t

Old speed = v

$vt=50⟹t=\frac{50}{v}$

New speed = 3 (old speed) = 3v

Let new time = T

$3vT=300⟹T=\frac{100}{v}=2t$

New time = 2 (old time)