Others Maths Puzzle

Q. 2%of3%of4%of5%.........of10 - 1%of2%of3%of4%.............of9 will be?

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Others Other Question

The value of (i)i A B C D want to get across a lake 312 miles across.
Swimming speeds in mph: A=4 B=8 C=12 D=16
They have a motorboat that goes at 48mph but this boat can only take 2 persons.
D leaves first; 2 hours later the other 3 leave.
During the last hour, a strong salmon decides to push the boat. This causes the boat to go 72mph during the last hour.
All 4 arrive on other side at same time, 16 hours after D left.
How many miles did the boat travel?
For how many hours did A swim?
How many miles did C swim?
How many hours was B in the boat?