974. A ship develops a leak 12 km from the shore. Despite the leak, the ship is able to move towards the shore at a speed of 8 km/hr. However, the ship can stay afloat only for 20 minutes. If a rescue vessel were to leave from the shore towards the ship and it takes 4 minutes to evacuate the crew and passengers of the ship, what should be the minimum speed of the rescue vessel in order to be able to successfully rescue the people aboard the ship?
(a) 53 km/hr
 
(b) 37 km/hr
 
(c) 28 km/hr
 
(d) 44 km/hr

975. Rajesh travelled from city A to city B covering as much distance in the second part as he did in the first part of this journey. His speed during the second part was twice as that of the speed during the first part of the journey. What is his average speed of journey during the entire travel?
(a) His average speed is the harmonic mean of the individual speeds for the two parts
 
(b) His average speed is the arithmetic mean of the individual speeds for the two parts
 
(c) His average speed is the geometric mean of the individual speeds for the two parts
 
(d) Cannot be determined

976. By walking at 3/4^{th} of his usual speed, a man reaches office 20 minutes later than usual. What is his usual time?
(a) 30 min
 
(b) 60 min
 
(c) 70 min
 
(d) 50 min

977. Due to hole at the bottom of the tank, a tap takes 2 more minutes to completely fill the tank. Due to leakage of water through this hole, a bucket filled completely with water gets emptied in 4 minutes. In how much time can the tap fill the tank, if there was no hole at the bottom at the tank?
(a) 8 min
 
(b) 2 min
 
(c) 4 min
 
(d) 6 min

978. A red light flashes 3 times per minute and a green light flashes 5 times in two minutes at regular intervals. If both lights start flashing at the same time, how many times do they flash together in each hour?
(a) 30
 
(b) 29
 
(c) 31
 
(d) 32

TOTAL
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