A) 2 m/s
B) 4 m/s
C) 3 m/s
D) 1 m/s
Correct Answer: A
Solution :
The average speed of the man is given by \[\text{ }\!\!\upsilon\!\!\text{ }\!\!\!\!\text{ =}\frac{\text{Total}\,\text{distance}}{\text{Total}\,\text{time}}\] or, \[\upsilon =\frac{{{\upsilon }_{1}}{{t}_{1}}+{{\upsilon }_{2}}{{t}_{2}}}{{{t}_{1}}+{{t}_{2}}}\] or \[\upsilon =\frac{1\times 60+3\times 60}{60+60}\] \[=\frac{60+180}{120}\] Hence, \[\upsilon =2m/s\]
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