Renu was sitting inside train A, which was travelling at 50 km/h. Another train, B, whose length was three times the length of A crossed her in the opposite direction in 15 seconds. If the speed of train B was 58 km/h, then the length of train A (in m) is:

Sixteen men can finish a work in 8 days. Eight men and nine women working together can finish the same work in 10 days. In how many days will twenty women finish the same work?

3 men or 5 women can do a work in 12 days. How long will 6 men and 5 women take to finish the work?

A car travels 228 km in 3 hours. How long will it take to travel 912 km & how far will it travel in 7 hours?

A sum amounts to Rs. 7,562 in 4 years and to Rs. 8,469.44 in 5 years. at a certain rate percent per annum when the interest is compounded yearly. If Rs. 10,000 at the same rate of interest is borrowed for two years, then what will be the compound interest (in Rs.) ?