(c) a bus travels a of distance 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:
34.3 km/hr.
Explanation:
Average speed=total distance travelled/total Time taken
total distance travelled=120+120=240km
Time taken for going=distance/speed =120/40=3 hrs.
Time taken for return=distance/speed=120/30=4 hrs
thus,
total time taken=3+4=7 hrs.
Average speed=240/7=
34.3 km/hr.
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