self Maths Puzzle

units digit of(1!+2!+3!+....+100!) is?

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self Other Question

Two cars C and D start from a junction along two perpendicular roads at 8.00 a.m and 9.00 a.m respectively.If at 12 noon, the cars which are travelling at same speed, are 150 km apart, then ,find the speed of each car. HD::JB
KD::HG then
SD::P?