Create an expression to find the time for the given distance and rate, and find the value of the expression.

d = 315 kilometers; r 35 kilometers/hour

the time is hours.

To find the time it takes for a body to travel a certain distance given its rate, divide the distance with the rate. By letting t be the time, the expression would be,

                                                     t = d / r

From the given, 
                                             t = 315 km / (35 km/h) = 9 h

Thus, it takes 9 hours for a body to travel 315 km given that its speed is 35 km/h. 

I’m not absolutely sure but i think it’s 7x6x5x4x3x2=5040 because as the first character you can take any of the 7 given then you are left with 5 then 6 then 4 etc.