00:01
Hi, so here in this question we have given that two bicycles, let us consider bicycle a and bicycle b, are riding a bicycles towards each other with the average speed of 10 km per hour.
00:21
They are 20 kilometers apart and when they are 20 kilometers apart a pesky fly.
00:29
We will consider this fly is moving from one wheel to another.
00:34
With back and forth with the constant speed of 30 km per hour.
00:45
Now we have to find out how much kilometer this fly travels until these two bicycles meet.
00:54
So for that first we have given the average speed of this bicycle.
00:59
So we will first consider or we can say that we will assume that the bicycle a travels with the speed of 10 km per hour and we will consider, and we will assume that the bicycle a travels with the speed of 10 km per hour and bicycle b travels with the speed of 10 km per hour then their average speed will be 10 km per hour and also we will consider that the time required for these two bicycles to meet or to cover the distance 20 km will be same as the time required for the flight to move back and forth so first we will find out the time required for these two bicycles and then use it to find out the distance covered by the fly.
01:42
So we have the formula distance equal to velocity into time.
01:48
So we will use this time equal to distance upon velocity.
01:55
Now here velocity will be for two bicycles.
01:59
So va plus vb...