Amotorboat traveling downstream covers the distance between port m and port n in 6 hours. once, the motorboat stopped 40 km before reaching n, turned around, and returned to m. this took the motorboat 9 hours. find the speed of the motorboat in still water if the speed of the current is 2 km/hour.

18 km/h

Step-by-step explanation:

Let S km be the distance between ports M and N, x km/h be the speed of the motorboat in still water. Then x-2 km/h is the speed of the motorboat upstream and x+2 km/h is the speed of the motor boat downstream.

1. The motorboat traveling downstream covers the distance between port M and port N in 6 hours, then

2. Once, the motorboat stopped 40 km before reaching N, turned around, and returned to M. This took the motorboat 9 hours. Then

From the first equation Substitute it into the second equation:

Now

The speed of the motorboat cannot be less than the speed of the current, thus, x=18 km/h.

step-by-step explanation:

no of data

divide by no of mode

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b