a) 24 km/hr
b) 36 km/hr
c) 40 km/hr
d) 45 km/hr
Answer: d
Explanation:
$$\eqalign{
& {\text{Distance travelled in 14 sec}} \cr
& {\text{ = 50 + }}l \cr
& {\text{Distance travelled in 10 sec}} = l \cr
& {\text{Speed of train}} \cr
& {\text{ = }}\frac{{50}}{{14 – 10}}{\text{m/sec}} \cr
& {\text{ = }}\frac{{50}}{4} \times \frac{{18}}{5}{\text{km/hr}} \cr
& {\text{ = 45 km/hr}} \cr} $$
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