Roni can walk a certain distance in 40 days when he rests 9 hours a day. How long will be take to walk twice the distance, twice as fast and rest twice as long each day?

A 35 days

B 55 days

C 100 days

D 82 days

Solution

Correct Answer: Option C

এখানে ,
১ম ক্ষেত্রে রনি প্রতিদিন হাটে =24-9=15 ঘণ্টা
2য়       "  "       "            "    =24-(2×9) "
                                           =24-18=6 ঘণ্টা করে


মনে করি ,১ম ক্ষেত্রে রনি x কি.মি /ঘণ্টা বেগে হাটে
                 ২য়   "      "   ২x  "       "         "      "
এখন ,
রনি x কি.মি /ঘণ্টা বেগে প্রতিদিন 15 ঘণ্টায় 1 অংশ হাটে 40 দিনে
"     1  "         "          "      "           1 "          1  "         "40×x×15
"     2x   "        "       "         "          1    "       1 "        " (40×x×15 /২x) "
"     2x   "        "       "         "          1    "       1 "        " (40×x×15 /২x×6) "
"     2x   "        "       "         "          1    "       1 "        " (40×x×15×2 /২x×6) "
                                                                                  =100 দিনে

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