Question

a tourist cab goes from delhi to agra in the morning and covers the journey of 240 km in 4.5 hr. the cab returns from agra to delhi during night-time covering the journey in 3.5 hr. calculate the average speed and average velocity of the cab for entire to and fro journey​

Answer 1

Answer: 60 km/r

Explanation: Speed = Distance/Time

                                  = 240 x 2 (since the journey was made twice)/3.5+4.5

                                  = 480/8

                                  = 60 km/hour

If you want separate speeds for to and from journey then:-

First trip speed (to Agra)

Speed = Distance/Time

           = 240/4.5 (now to take care of the decimal you can either convert to m/s or multiply it by 10/10, I have taken the second method since its faster and easier)

            = 240/4.5 x 10/10

            = 2400/45

            = 53.33.... km/hour (recurring decimal)

Same for second trip (to dehli)

Speed = 240/3.5

           = 240/3.5 x10/10

           = 2400/35

           = 68.5714... km/hour (non-terminating decimal)