If Rs.X is the price of 10 pens that cost Rs.42 per dozen, and Y hours is the time taken to travel 175 km at 12.5 km/h, then the value of X2 + Y2 is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 1421.
Calculations:
According to the question;
Cost of 12 pens = Rs. 42
Cost of 10 pens = Rs. (42/12) × 10
⇒ Rs. 35
Now, we know that
Time = Distance/Speed
⇒ Required time = 175/12.5
⇒ 14 hours
Required value of X2 + Y2 = 352 + 142
⇒ 1225 + 196
⇒ 1421