Book Maths Puzzle Logical Reasoning General Mental Ability

2,4,7,35,42,462..???
a)5016
b)470
c)4712
d)475

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Book Other Question

1! + 2! + 3! +4!+......+99!
digit in the unit position of the integer is ? Mary brisk walks at a speed of 9km/h along a small road. The road is parallel to light rail transit track. She realises a train passes her from behind every 8 minutes. An oncoming train also passes her every 5 minutes. Assume the trains travel at a constant speed and leave their terminals at fixed intervals. What is the speed of the trains?