Carcass wrote:
If two trains ,travelling at a speed of 72mph and 48 mph respectively, are approaching each other from opposite direction; what is the distance between them 1 minute before the collision ?
A)2 miles
B)3 miles
C)4 miles
D)5 miles
E)none of the above.
I call this a
shrinking gap question.
When we ADD the speeds of the trains, we get 72 mph + 48 mph = 120 mph
This means, the gap SHRINKS at a rate of 120 miles per HOUR
We can also say that
the gap SHRINKS at a rate of 2 miles per MINUTEWhat is the distance between them 1 minute before the collision ?Since the gap SHRINKS at a rate of
2 miles per MINUTE, we can conclude that, 1 minute before the collision, the trains will be 2 miles apart.
Answer: A