1. Mac travels from A to B a distance of 250 miles in 5½ hours. He returns to A in 4 hours 30 minutes. His average speed is:

(a) 42 mph
(b) 49 mph
(c) 48 mph
(d) 50 mph

2. A boy goes to his school from his house at a speed of 3 km/hr and returns at a speed of 2 km/hr. If he takes 5 hours in going and coming, the distance between his house and school is:

(a) 8.5 km
(b) 5.5 km
(c) 6 km
(d) 9 km

3. The average speed of a train in the onward journey is 25% more than that in the return journey. The train halts for one hour on reaching the destination. The total time taken for the complete to and for journey is 17 hours, covering a distance of 800 km. The speed of the train in the onward journey is:

(a) 50 km/hr
(b) 53 km/hr
(c) 52 km/hr
(d) 56.25 km/hr

4. A man on tour travels first 160 km at 64 km/hr and the next 160 kin at 80 km/hr. The average speed for the first 320 km of the tour is:

(a) 35.55 km/hr
(b) 38 km/hr
(c) 71.11 km/hr
(d) 75 km/hr

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