Question : Some students went on a field trip. At a speed of 6 km/hr, they travelled by bike for 2 hours; then at a speed of 2 km/hr, they walked for another hour; then they rested for an hour and had lunch for half an hour; then at a speed of 1 m/s, they walked for an hour to visit a garden; and finally at a speed 4 km/hr, they returned home in 3 hours. Their average speed, in km/hr, (rounded off to two places of the decimal) is:
Option 1: 3.48
Option 2: 129.23
Option 3: 0.28
Option 4: 251.62
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Correct Answer: 3.48
Solution : Total distance covered by them = $(6\times2) + (2\times1) + (1×\frac{18}{5}) + (4\times3)$ = $12 + 2 + 3.6 + 12 = 29.6$ km Total time = 2 + 1 + 1.5 + 1 + 3 = 8.5 hr Average speed = $\frac{29.6}{8.5}=$3.48235 = 3.48 km/hr approx. Hence, the correct answer is 3.48.
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