Nabhitha left her house at time zero and drove to the store, which is 21 blocks away, at a speed of 7 blocks every 2 minutes. Then she stopped and went into the store for 5 minutes. From there, she drove in the same direction at a speed of 1 block per minute until she got to the bank, which is 3 blocks away from the store. She stopped at the bank for 7 minutes. Then she drove home at a speed of 12 blocks every minute. Make a graph of showing the number of blocks away from home that Nabhitha is xx minutes after she leaves her house, until she gets back home.