Chhattisgarh Board Solutions for Exercise 9: Exercise – 3

A car leaves Saraipalli, travels at $75$ km per hour and reaches Raipur in $4$ hours. The next time there was traffic and construction work on the road due to which the speed is decreased by $15$ km per hour. If the car will take $k$ hours to reach Raipur, find $k$.

If $10$ bulbs are lighted $4$ hours every day for $60$ days then the electricity bill is $₹80$. How many bulbs can be lighted for $3$ hours every day for $16$ days so that the electricity bill is $₹40$?

A task is completed by $48$ persons in $25$ days if they work $8$ hours per day. How many days will be needed to complete double the task if $30$ persons work for $10$ hours every day?

$A$ and $B$ together complete a task in $24$ days, $C$ and $B$ together complete the same task in $18$ days, and $A$ and $C$ together complete the task in $12$ days. How many days will $A$ take to complete the task if he works alone?

A task is completed by $15$ men in $16$ days. How many men will be needed to complete ${\left(\frac{1}{4}\right)}^{\mathrm{th}}$ of the task in $15$ days?

A camp of $120$ soldiers has sufficient provisions for $60$ days. If after $40$ days, $40$ soldiers were deputed elsewhere, how long will the remaining provisions last for the remaining soldiers?

If $11$ spiders spin $11$ webs in $11$ days then how many webs will one spider spin in one day?

Two taps together fill a tank in $6$ hours. One of the taps alone fills it in $10$ hours. How long will it take to fill the tank if only the second tap is open?