Jamal covered a distance of 340 miles between city A and B taking a total of 5 hours. If part of the distance was covered at 60 miles per hour speed and the balance at 80 miles per hour speed, how many hours did he travel at 60 miles per hour?
Solution
Correct Answer: Option C
মনেকরি,
60 মাইল বেগে x ঘণ্টা যায়
∴ 80 " " (5-x) ঘণ্টা
প্রশ্নমতে,
60x + 80(5-x) = 340
⇒ 60x + 400 - 80x = 340
⇒ 20x = 60
⇒ x = 3
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