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Lee is walking at a quarter of the speed that Bee is cycling, which is 34 kmph slower than Dee is driving...............

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Lee is walking at a quarter of the speed that Bee is cycling, which is 34 kmph slower than Dee is driving.
If Dee covers the same distance after driving for 8 minutes as Bee would cover after cycling for 25 minutes, at what speed is Lee walking?

posted Feb 8, 2018 by Rahul Vaidya

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1 Answer

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Speed of Dee - Speed of Bee = 34 kmph
Distance =Speed of Dee × 8/60(hours) = Speed of Bee × 25/60(hours)
= Speed of Dee × 8/60(hours) = (Speed of Dee - 34) × 25/60(hours)
= Speed of Dee = (Speed of Dee - 34) × 25/8
= Speed of Dee = Speed of Dee × 25/8 - 34 × 25/8
= 34×25/8 = Speed of Dee × 25/8 - Speed of Dee
= 34×25/8 = Speed of Dee × 17/8
Speed of Dee = 34×25×8/(8×17) = 50 Kmph
Speed of Bee = 50 - 34 = 16 Kmph
Speed of Lee = 16/4 = 4 Kmph.

answer Feb 9, 2018 by Tejas Naik

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