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1). 200/16 km/h2). 120/17 km/h3). 200/13 km/h4). 400/15 km/h |
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Answer» ⇒ Average = sum of ELEMENTS / number of elements Given, Let the total distance and total time be d and t respectively. Given, (30/100)d at 60 km/h (45/100)d at 45 km/h (15/100)d at 60 km/h And remaining 100 - (30 + 45 + 15) = 10% ⇒ (10/100)d at 5 km/h ⇒ t = [(3d/10)/60] + [(9d/20)/45] + [(3d/20)/60] + [(d/10)/5] ⇒ t = 15d/400 Average rate = d/t Average rate = 400/15 km/h |
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