Two points L and M are 160m apart M lies on the stright line joining L and N .An object travels from L to M at an average speed of 10m/s in 6 seconds and then from M to N at an average speed of 25m/s . Find the average speed of the object for its entire journey.
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Distance = (Rate)(Time)
Distance from L to M = (10m/sec)(6sec) = 60 m
Distance from M to N = 160 - 60 = 100 = (25)T (T is the time it takes to go from M to N)
So, T = 4 sec
Average speed for the entire trip = (Total Distance) / (Total Time) = 160 / (6+4) = 16 m/sec.
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