Question

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

Answer 1

Let the speed in first cover = x miles/hr,

therefore, speed in second cover = 3x miles/hr.

Therefore, time taken in first cover = distance/speed = 50/x hr

While, time taken in second cover = 300/3x hr = 100/x hr.

 New time taken would be twice as much as the old.

Answer 2

Answer:

Explanation:

Solution:

Let speed of the 1st trip x miles / hr. and speed of the 2nd trip 3x / hr.

We know that

Speed = Distance/Time.

Or, Time = Distance/Speed.

So, times taken to covered a distance of 50 miles on his first trip = 50/x hr.

And times taken to covered a distance of 300 miles on his later trip = 300/3x hr.

= 100/x hr.

So we can clearly see that his new time compared with the old time was: twice as much.

Answer: (b)