in a competition plus 5 marks are given for every correct answer and -2 marks for every incorrect answer . Rohan answered all the questions and scored -12 marks if he has got four correct answers how many questions did he answered incorrect ​

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling