"A construction company has a number of trucks designed to haul different amounts. The line plot displays the weight each truck can haul. If all the trucks are working at the same time, how many tons can the trucks carry?" I would also like a explanation too please.

How to solve a simultaneous equation involved with fractions?

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

60 2(x + 2) in the diagram, gef and hef are congruent. what is the value of x?