6. A body travels a distance of 10 km with a constant speed of 30 km h-1 and then the next 40 km at a constant speed of 50 km h-1. Find the average speed for the whole journey.
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- AB 10/ 30 =1/3
- BC 40/50= 4/5
Average speed = total distance / total time = 10+40/17/15= 50/17/15= 50×15/17 = 44 km/ hr
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