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A car travels hundred kilometre distance at a speed of 60 km per hour and returns with a speed of 40 km per hour calculate its average speed for the whole journey with the diagram |
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Answer» Distance/speed = 100/60 hr = (100/60)*60 = 100 mins Speed return = 40 km/h time TAKEN ONE SIDE = Distance/speed = 100/40 hr = (100/40)*60 = 150 mins Total time take = 100 + 150 = 250 min = 250/60 hr = 25/6 hr Total distance = 100 + 100 = 200 km Average speed = 200/(25/6) = 48 km/hr Hope it helps ✅❤ |
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