CUET · MATHS · PYQ PAPER 2023
If a young man drives his vehicle \(25 km / hr\), he has to spend Rs. 2 per km on petrol.
If he drives it at faster speed of \(40 km / hr\), the petrol cost increases to Rs. 5 per km.
He has Rs. 100 to spend on petrol and travel within one hour. The maximum distance he travels is :
- A 20 km
- B 100 km
- C 30 km
- D 50 km
Answer & Solution
Correct Answer
(C) 30 km
Step-by-step Solution
Detailed explanation
Let \(d_1\) be distance at \(25 \, km/hr\) and \(d_2\) be distance at \(40 \, km/hr\). Cost constraint: \(2d_1 + 5d_2 \le 100\) Time constraint: \(\frac{d_1}{25} + \frac{d_2}{40} \le 1 \Rightarrow 8d_1 + 5d_2 \le 200\) To maximize total distance \(D = d_1 + d_2\), we solve the…
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