Question

a bus travels a distance of 120km/hr with a speed of 40km/hr and returns with a speed of 30kn/hr.calculate the average speed for the entire journey.

Answer 1

Average Speed =    Total distance travelled 
                                -------------------------------
                                     Total time taken 
                         
                          =           120 + 120
                                --------------------------
                                (120/40) + (120/30)
                          
                           =       240
                                --------------
                                   3 + 4

                           =     240 / 7
                      
                           =   34.2 KMPH

Answer 2

Heya mate!!!!!!!

In first case:

distance= 120 km
speed= 40 km/ hr
time = 120÷40
= 3 hrs.

In second case:

distance= 120 km
speed = 30 km/ hr
time = 120÷30
= 4 hrs.

Total distance covered= 120+120
=240 km

Total time taken = 3+4
= 7 hrs.

Average speed= Total distance covered ÷ total time taken

Average speed = 240÷ 7
= 34.28 km/ hr.

Hope it helps!!!!!!

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