Check the admob Sdk what you are using in your Xcode. Go to https://developers.google.com/mobile-ads-sdk/download#downloadios and check is there any new sdk. if find new one then download it and replace the old one. It worked for me.
The Analog clock: At first, it’s best to focus on ensuring the child understands the significance of each hand: When we start playing with the clock, first of all, we teach the hours, before we start moving the minute hand five minutes at a time: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55. Once they’ve played with the clock for a while, and understand what each hand indicates, we can teach them quarters; a quarter of an hour, half an hour, and three-quarters of an hour. At the same time, we can show them the time on a digital clock, which helps simplify the exercise since the exact minutes are shown in number form. Since the numbers on an analog clock only go up to 12 and a day consists of 24 hours, when we read the time in analog we need to add “am” or “pm” to indicate the correct time.