B) A bus travels a distance of 120 km with a speed of 40 km/h and returns with a speed of 30 km/h.
Calculate the average speed for the entire journey.
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Answer:
34.29 km/hr
Step-by-step explanation:A.S= Total distance/ total time
t.d= 120×2 = 240 km
t.t = (120/40) + (120/30)
= 7 hrs
A.S = 240 km/ 7 hrs
=34.285
=34.29 km / hr
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