# IMO Level 1- Mathematics Olympiad (SOF) Class 10: Questions 506 - 510 of 968

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## Question number: 506

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MCQ▾

### 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

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MCQ▾

### 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

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MCQ▾

### 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

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MCQ▾

### 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

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MCQ▾

### 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

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