book Maths Puzzle Numerical Ability

Two planes leave Chicago-one traveling due east and the other due west. The first travels 100 miles per hour faster than the second. How long will it be until they are 2000 miles apart?

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book Other Question

a football team has won 4 out of 7 games played. if there are 16 games in a season, how many more games must be won to give the team, a season record of at least 60% games won out of all games played? please help me solve this equation: 0.5w=0.35