A woman travelled at a speed of 20 m/min
A woman travelled at a speed of 20 m/min for 90 min, and at a speed of 72 m/min for 66 min. Her average speed (in m/min) for the entire journey is:
एक महिला ने 90 मिनट तक 20 मीटर/मिनट की चाल से तथा 66 मिनट तक 72 मीटर/मिनट की चाल से यात्रा की। पूरी यात्रा के लिए उसकी औसत चाल (मीटर/मिनट में) ज्ञात कीजिए।
Detailed Solution & Logic
Correct Answer:
42
Step 1: Find total distance
Distance covered in first part:
$20 \times 90 = 1800$ m
Distance covered in second part:
$72 \times 66 = 4752$ m
Total distance:
$1800+4752=6552$ m
Step 2: Find total time
Total time:
$90+66=156$ min
Step 3: Calculate average speed
Average speed:
$\frac{6552}{156}=42$
Final Answer: 42 m/min
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