Others Maths Puzzle

X is picked up from school by his father daily to go home is a car. One day school leaves before 1 hour. so X starts walking towards his house at 3km/h. As a result they reach home 15 mins before time. Find the speed of his father's car.

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Others Other Question

For the word 'RAINBOW', how many words are there in which vowels are never together ? How many words are there in which A is always before I and I is always before O ? Explain the answers please. In how many diff ways we can distribute 5 diff balls in 3 diff boxes such that no box is empty?