A clock is set right at 8 a.m. The clock gains 10 minutes in 24 hours. What will be the true time when the clock indicates 1 p.m. on the following day?
Explanation:
From 8 a.m. to 1 p.m. next day is 29 hours. The clock gains 10 min in 24 hours, so in 29 hours gains (10/24)×29 = 145/12 ≈12.083 min. When clock shows 29 hours, actual time passed is 29 - 12.083/60 hours ≈28 hours 47.9 min, so true time is about 12:48 p.m. Standard answer is 48 min past 12.
In a row, Rina is 10th from left and Seema is 8th from right. If they interchange positions, Rina becomes 20th from left. How many students are in the row?
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