Which of the following statement(s) is/are true?

1.Speed of x m/sec is equal to x 5/18 km/hr.

2.If a train runs at 5/6 of its usual speed, it gets late by 10 minutes. The usual time of the train to cover the journey is 40 minutes.

3.A car moves at the speed of 80 Km/hr. The speed of the car in meters per second is 22 2/9.

4.A person crosses a 600 m long street in 5 minutes. The speed of the person in Km per hour is 7.2.

A1, 2 & 3 only

B1 & 2 only

C2, 3 & 4 only

D3 & 4 only ✓ Correct

Correct answer: (D) 3 & 4 only

Explanation

Statements 3 and 4 are correct.

Statement 1: m/sec to km/hr uses x 18/5, not x 5/18.

Statement 2: 1.2T - T = 10 gives usual time T = 50 min, not 40.

Statement 3: 80 x 5/18 = 22 2/9 m/sec.

Statement 4: 600/300 = 2 m/sec = 2 x 18/5 = 7.2 km/hr.

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