A body takes 4 hours to travel from place A to place B at the rate of 60 miles per hour. It then takes 2 hours to travel from B to C with 50% increased speed. Find the average speed from A to C.
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Answer:
70 mi/hour
Step-by-step explanation:
1). The distance from A to B is 60 × 4 = 240 miles.
2). 50% increased speed is 60 × (100 + 50)% = 60 × 1.5 = 90 mi/h
3). The distance from B to C is 90 × 2 = 180 miles.
4). Total distance body traveled is 240 + 180 = 420 miles.
Total time it takes is 4 + 2 = 6 hours
5). Average speed is v = d / t
v = 420 ÷ 6 = 70 miles per hour
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