Question
Two individuals, A and B, are walking. Person A takes 1
hour longer than person B to cover a distance of 84 km. However, if person A doubles their speed, they take 2 hours and 30 minutes less than person B to cover the same distance. Find the original speed of person B (in km/h).Solution
Let speed of A and B be ‘x’ km/h and ‘y’ km/h respectively.
According to question;
84/x – 84/y = 1…………………..(1)
And, 84/y – 84/2x = 5/2…………………(2)
From equation (1) and (2) we get
84/x – 1 – 84/2x = 5/2
42/x = 5/2 + 1 = 7/2
x = 12
So, y = 14 km/h
1Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 6Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ...
7Â Â Â Â Â 14Â Â Â Â Â 42Â Â Â Â Â 168Â Â Â Â Â Â 840Â Â Â Â Â ?
...299, 302, 308, 317, ?, 344
8 9 22 75 316 ?
...1Â Â Â Â 1Â Â Â Â 8Â Â Â Â 4Â Â Â Â 27Â Â Â Â 9Â Â Â Â ?
...If  3  12  108  x   43200
Then, 47% of (x + 72)= ?
14 20 35 ? 433 2167
...16     17      25      ?     99    180
...53 ? 55 49 57 47
...171, 173, 183, 213 , ‘?’, 411, 633.
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