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David allows himself 20 minutes to get to a railway station 3.6 km away .After cycling 1 km at 11.2 km/hr he is delayed 5 min.At what speed must he do the rest of the journey to arrive on time?

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A box contains 5 sets of balls while there are 3 balls in each set.Each set of balls has one colour which is different from every other set, what is the least number of balls that must be removed from the box in order to claim with certainty that a pair of balls of the same colour has been remoed?
A)6 B)7 C)8 D)9 Christine and Siri have 21rs between them. Christine has 20rs more than Siri. How much does each have. You cant use fractions in the answer