A driver of an auto rickshaw sees a lorry m ahead of him .After 30 seconds the lorry 90 m behind. If the speed of the auto rickshaw is 38 km /hr, then what is the speed of the lorry?

dsuc.created: 5 years ago | dsuc.updated: 4 years ago

dsuc.updated: 4 years ago

23 km/hr

25 km /hr

20 km /hr

18 km /hr

Combined Bank (সমন্বিত ব্যাংক) জনতা ও রূপালী ব্যাংক- অফিসার ১৩.১২.২০১৯ গণিত সম্ভাব্যতা (Probability) Have You Any Favourite Pastime? গড় (Average)

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 $R e l a t i v e S p e e d = \frac{T o t a l d i s \tan c e}{T o t a l t i m e} = \frac{60 + 90}{30} = \frac{150}{30} = 5 m / s .' . 5 m / s = 5 \times \frac{18}{5} = 18 k m / h r N o w, r e l a t i v e s p e e d = s p e e d o f a u t o r i c k s h a w - s p e e d o f l o r r y \Rightarrow 18 = 38 - s p e e d o f l o r y \Rightarrow s p e e d o f l o r r y = 38 - 18 = 20 k m / h r$

5 years ago

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Md Azizur Rahman

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MD.YELIAS

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A driver of an auto rickshaw sees a lorry m ahead of him .After 30 seconds the lorry 90 m behind. If the speed of the auto rickshaw is 38 km /hr, then what is the speed of the lorry?

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