Question

Ali was supposed to meet his friend in the evening every Sunday. The first time
he came at 4.30, the next time at 5.20, then at 6.30, then at 8.00. When did he
turn up the last time after that?​

Answer 1

Answer:

Step-by-step explanation:

9:50

Answer 2

The last time he turned up after that is 9:50 PM.

Given: Ali was supposed to meet his friend in the evening every Sunday. The first time he came at 4.30, the next time at 5.20, then at 6.30, then at 8.00.

To Find: The last time he turned up after that.

Solution:

• We need to proceed with this question by checking the differences between the times given, to find some kind of a sequence.
• Checking the difference between the times, we get;

       ⇒ 5:20 PM - 4:30 PM = 50 min

       ⇒ 6:30 PM - 5:20 PM = 70 min

       ⇒ 8:00 PM - 6:30 PM = 90 min

So, we see the sequence is an arithmetic progression starting with 50 min and having a common difference of 20 min.

So, the time will be after 20 min, i.e, ( 90 + 20 ) min = 110 min

So, it will be 110 min (or 1 hr 50 min) after 8:00 PM.

So, the time is = 8:00 + 1:50

                        = 9:50 PM

Hence, the last time he turned up after that is 9:50 PM.

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