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An object travels 24 m in 3 s and then another 15 m in 2 s. What is the average speed of the object?
A6.67 m/s
B8.0 m/s
C9.75 m/s
D7.8 m/s
Answer & Solution
Correct answer: D. 7.8 m/s
1. Total distance = 24 + 15 = 39 m.
2. Total time = 3 + 2 = 5 s.
3. Average speed = 39 / 5 = 7.8 m/s.
_Source: RRB Group D CEN-02/2018 PYQ, Q.77._