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If a car travels first 20 km at speed of 40km/h-1 and next 40km at a speed of 80km/h-1. find the speed |
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Answer» Answer: 60 kmph Explanation: 1st CASE: distance= 20km speed=40kmph TIME=distance/speed =20/40 = 1/2 hr 2nd case: distance=40km speed=80kmph time = 40/80=1/2 hr hence, for equal time, AVERAGE speed:- (speed1+speed 2) /2 =(40+80) /2 =120/2 = 60kmph.......(ANS) |
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