Try this interesting brain teaser?

Question

A Ferrari is traveling at 30 miles per hour on a head-on collision course with a Maserati, which is being driven at a leisurely 20 miles per hour. When the two cars are exactly 50 miles apart, a very fast fly leaves the front fender of the Ferrari and travels towards the Maserati at 100 miles per hour. When it reaches the Maserati, it instantly reverses direction and flies back to the Ferrari and continues winging back and forth between the rapidly approaching cars. At the moment the two cars collide, what is the total distance the fly has covered?

Answer 1

100 Miles?!?!?!




At first glance it may seem that a horrendous calculation is necessary to solve this: the sum of an infinite series of numbers that get smaller and smaller as the cars approach each other. But if you focus on time rather than distance, a solution is easy. The cars are 50 miles apart and traveling towards each other at a combined speed of 50 miles per hour, so they will meet in one hour. In that hour, a fly that flies at 100 miles per hour will naturally travel 100 miles

Answer 2

The fly traveled 50 miles.
50 kms from Ferrari to the Maserati,it has not returned back as the cars have collided before that.

Answer 3

The combined speed of both the cars is 600 miles/hour or 10 miles per minute. When cars are exactly 50 miles apart means
they are 5 minutes apart. Since fly is moving at a speed of 100 miles an hour or 1.67 miles per minute, it would have flown for 1.67 x 5 = 8.35 miles by the time both cars collide.

Answer 4

In an hour it has covered 100 miles.

Answer 5

3 times
1st after 30 minutes when both the cars have travelled 25miles
2nd at 45th minute 37.5 miless and last
at the time of accident (60th minute, i.e after 1 hour)

the force with which the cars collided.... is equivalent to the force / pressure which will be exerted on balls ;)

Answer 6

No distance at all as the cars come to him, but unless he moves he will have a head ache!