Given below are two statements based on the following:
A Car travels 25 km/hour faster than a bus for a journey of 500 Km, and the bus takes 10 hours more than the car.
Statement (I): Speed of the car is 45 km/hour.
Statement (II): Speed of the bus is 20 km/hour.
In the light of the above statements, choose the correct answer from the options given below:निम्नलिखित के आधार पर नीचे दो कथन दिए गए हैं:
500 किमी की यात्रा में एक कार बस की तुलना में 25 किमी/घंटा अधिक तेज़ चलती है, और बस कार से 10 घंटे अधिक समय लेती है।
कथन (I): कार की चाल 45 किमी/घंटा है।
कथन (II): बस की चाल 20 किमी/घंटा है।
उपर्युक्त कथनों के आलोक में, नीचे दिए गए विकल्पों में से सही उत्तर का चयन कीजिए:
Pick an option to check yourself, or open the answer below.
Show answer & explanation
Correct answer: B. Both Statement (I) and Statement (II) are falseकथन (I) और कथन (II) दोनों असत्य हैं
Explanation
Let the bus speed be v, so the car speed is v + 25. Then 500/v − 500/(v + 25) = 10, i.e. 500 × 25 = 10v(v + 25), so v² + 25v − 1250 = 0, giving v = 25. Thus the bus runs at 25 km/h and the car at 50 km/h, so both statements (45 km/h and 20 km/h) are wrong. Answer: Both statements are false.मान लीजिए बस की चाल v है, तो कार की चाल v + 25 है। तब 500/v − 500/(v + 25) = 10, अर्थात् 500 × 25 = 10v(v + 25), अतः v² + 25v − 1250 = 0, जिससे v = 25। इस प्रकार बस की चाल 25 किमी/घंटा तथा कार की चाल 50 किमी/घंटा है, अतः दोनों कथन (45 किमी/घंटा तथा 20 किमी/घंटा) गलत हैं। उत्तर: दोनों कथन असत्य हैं।More Mathematical Reasoning and Aptitude questions
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