Question

A car takes 7 hours to cover a certain distance at the speed of 48 km per hour is this period is decreased buy current only 20 km per hour how much time will it take to cover the same distance

Answer 1

let the distance it travelled be = x km

                              time taken = 7 hours

                              speed         =48 km/h

we know that d=st

                     x=48(7)=336km

now decreased speed = 48-20=28km/h

                    distance=336km

                     time=d/s

                            =336/28=12 hours

      therefore it takes 12 hours

Answer 2

let the distance it travelled be = x km

                              time taken = 7 hours

                              speed         =48 km/h

we know that d=st

                     x=48(7)=336km

now decreased speed = 48-20=28km/h

                    distance=336km

                     time=d/s

                            =336/28=12 hours

      therefore it takes 12 hours