Its the problem where we can use diagram. So take the look 300+10+10+10+10+10+10+10+10+10+10=300+10 10=400 There was 10 steps Now we can just add 10 Hans's steps to 400 400+10 100=1400 (times 100 because Hans counted back by hundreds) The answer is 1400.
Sally starts counting from 300 by tens and reaches 360 after six counts. Hans counts back by hundreds and after six counts reaches the same number at 360. Therefore, Hans must have started from 960.
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KPK from 6,8,15 is 120So,they will go again after 120 days later which is on 1 May 2019.