a car covers 30 km at a uniform speed of 30 km per hour what should be its speed for the next 90 km if average speed for entire journey is 60 km per hour
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the speed should be 90 km /h so total time =2 houe and total dis =120 and aberahe speed=60 km/h.
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speed 1 for 30 km is 30km/s
speed 2 for 90 km is speed 2
avg speed = s1 + s2 / 2
60 × 2 = 30 + s2
120 - 30 = s2
s2 = 90 km/h
speed 2 for 90 km is speed 2
avg speed = s1 + s2 / 2
60 × 2 = 30 + s2
120 - 30 = s2
s2 = 90 km/h
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