16. Driving at 6/7 of his usual speed, a man reached his destination 12 minutes late. Find his usual time.
a. 1 hour
b. 1 hour 12 minutes
c. 1 hr 15 minutes
d. 1 hr 20 minutes
Answer: b. 1 hour 12 minutes
17. A and B decide to go for a walk from 8 am to 9:30 am. A takes 2 rounds in 1 hour while B takes 3 rounds in an hour. How many times will they meet on the way in this one and a half hour?
Answer: c. 7
18. Two stations P and Q are 330 km apart. A train leaves the station A at 8 am and runs towards B at 60 kmph. Another train travels from B to A at a speed 75 kmph. What would be the time by the watch when the two trains meet?