Question

DIRECT AND INVERSE PROPORTIONS [EXTRA QUESTIONS]

1. A train is moving at a uniform speed of 100 km/h. How far will it travel in 20
minutes?

2. Six pumps working together empty a tank in 28 minutes. How long will it take
to empty the tank if 4 such pumps are working together?

3. A train travels 112 km in 1 hour 30 minutes with a certain speed. How many
kilometres it will travel in 4 hours 45 minutes with the same speed?

4.  15 men can build a wall in 42 hours, how many workers will be required for the
same work in 30 hours?

5. Mohit deposited a sum of ₹ 12000 in a Bank at a certain rate of interest for 2
years and earns an interest of ₹ 900. How much interest would be earned for a
deposit of ₹ 15000 for the same period and at the same rate of interest?

6. A garrison of 120 men has provisions for 30 days. At the end of 5 days, 5 more
men joined them. How many days can they sustain on the remaining provision?

I not understanding Total surface area