। हामिद के घर से डेविड का घर 19 किमी दूर है। प्रातः 9 बजे वे एक दूसरे के घर के लिए साइकिल
द्वारा प्रस्थान करते हैं। यदि हामिद की चाल किमी प्रति घंटा और डेविड की चाल 10किमी प्रति
घंटा हो तो, वे दोनों हामिद के घर से कितनी दूरी पर तथा कब मिलेंगे ?

In a study, people were asked to imagine simple occasions that made them happy and to remember events that made them feel proud about themselves. it was observed that the subjects developed an increasingly positive attitude. these changes are known to be healthy, leading to greater physical activity and reducing unhealthy habits. based on this excerpt, we can conclude that a positive attitude .