SSC GD Constable previous year question
A car left 42 minutes earlier than the scheduled time but in order to reach its destination 210 km away in time, it had to slow its usual speed by 10 km/hr. What is the usual speed of the car?
Asked in SSC GD Constable 2024: 22 Feb 2024 Shift 3 · Quantitative Aptitude
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Correct answer: (B) 60 km/hr
With 42 min extra time: 210/(v−10)−210/v=0.7 ⟹ v²−10v−3,000=0 ⟹ v=60 km/hr.
हिंदी में प्रश्न
एक कार ने अपने निर्धारित समय से 42 मिनट पहले चलना शुरू किया, लेकिन 210 km दूर अपने गंतव्य तक समय पर पहुंचने के लिए उसे अपनी सामान्य चाल 10 km/hr धीमी करनी पड़ी। कार की सामान्य चाल कितनी है?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) 60 km/hr
With 42 min extra time: 210/(v−10)−210/v=0.7 ⟹ v²−10v−3,000=0 ⟹ v=60 km/hr.
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