a) 684 km
b) 600 km
c) 624 km
d) 584 km
Answer: b
Explanation: Let the total distance be 2X.
A_____X km_____M_____X km_____B
Total time taken in the journey = 17.5 hours
Time taken to cover X km at 30 km/h = $$\frac{{\text{X}}}{{30}}$$
Time taken to cover X km at 40 km/h = $$\frac{{\text{X}}}{{40}}$$
$$\eqalign{
& {\frac{X}{{30}}} + {\frac{X}{{40}}} = 17.5 \cr
& {\frac{{ {40X + 30X} }}{{1200}}} = 17.5 \cr
& 70X = 17.5 \times 1200 \cr
& X = 300\,km \cr
& {\text{Total}}\,{\text{distance}},\,2x \cr
& = 600\,km \cr} $$
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