At a distance of 30 km, one skier skied 20 minutes faster than the other. the first skier skied at 3km / h faster than the second. at what speed did each skier skied?
pls, can someone solve this problem?

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the answer would be d

straight away you can eliminate a and c because not all books contain a scientific skill because some may be fiction. c is also wrong because it saids that the only way children can learn is through books which is incorrect.

b is also wrong because reading can be a scientific skill but not always, therefore it is wrong which leaves you with d, the correct answer since it said that it can children learn.

hope this ! : 3