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Mr. Amit can walk 8 km in 1 hour 20 minutes.(a) How far does he go in :(i) 10 minutes ?(ii) 30 seconds ?(b) How long will it take him to walk :(i) 2500 m ?(ii) 6.5 km |
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Answer» Amit walks 8 km in 1 hour 20 min Or 1.1/3 = 4/3 hours ∴ Speed = Distance/Time = 8/(4/3) = (8 × 3)/4 = 6 km/h (a) (i) Distance covered in 10 minutes = (6 × 1000 × 10)/ 60 = 1000 m = 1 km (ii) Distance covered in 30 seconds = (6 × 1000 × 30)/(60 × 60) = 50 m (b) (i) Time taken in 2500 m = 2500/(1000 × 6) = 5/12 hours = 5/12 × 60 = 25 minutes (ii) Time taken in 6.5 km = 6.5/6 = 65/60 hours = 1 hours 5 minutes |
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