Question

A car travels from stop a to stop b with a speed of 30km/h and then returns back to a with the speed of 50 km/h find the distance covered by the car

Answer 1

Average speed =total distance /time
let the distance travelled from A to B= x km
then,
total distance travelled = 2x km
time while going from A to B = D/S
                                             =x/30 hours
time while returning = x/50 hours
total time = x/30 + x/50
                =5x+ 3x 
                    150
                 =8x/150
                  =4x/75 hours