book Maths Puzzle Numerical Ability

Irma invested some money a 7% and $100 less than that at 8%. Her total interest was $58. How muc did she invest at 7%, rounded to the nearest dollar?

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EaCH DAY A TRAIN LEAVES PARIS FOR MOSCOW AND AT THE SAME TIME ONE LEAVES MOSCOW FOR PARIS. THE JOURNEYS LAST EXACTLY SEVEN DAYS. HOW MANY TRAINS WILL A PASSENGER MEET ON THE JOURN Mr X spent 2.5 hrs biking up a mountain. Rested for 30 minutes. Biked down in 1.5 hrs. How far did Mr. X bike, if his rate of ascent was 3 km/hr less than his rate of decent?