IMO Level 1 Mathematics Olympiad (SOF) Class 10: Questions 506  510 of 968
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Question number: 506
Question
Six bells commence tolling together and toll at intervals of 2,4, 6,8, 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together?
Choices
Choice (4)  Response  

a.  15  
b.  16  
c.  10  
d.  4 
Question number: 507
Question
Ramesh travels a certain distance at 6 km/hr and reaches 20 min. late. If he travels at 8 km/hr, he reaches 20 min. earlier. The distance he has to travel is ________
Choices
Choice (4)  Response  

a.  8 km  
b.  5 km  
c.  6 km  
d.  7 km 
Question number: 508
Question
X, Y and Z start at the same time in the same direction to run around a circular stadium. X completes a round in 160 seconds, Y in 260 seconds and Z in 200 seconds, all starting at the same point. After what time will they meet again at the starting point?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 509
Question
A train 100 meters long moving at a speed of 50 km/hr crosses a train 120 meters long coming from opposite direction in 6 seconds. The speed of second train is ________
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 510
Question
A boy was asked to multiply a given number by . Instead, he divided the given number by and got the result 225 more than what he should have got if he had multiplied the number by . The given number was ________.
Choices
Choice (4)  Response  

a.  17  
b.  136  
c.  64  
d.  8 