Question
Meena left from her house on a scooter at 18 m/s. Her
sister Neha started 6 seconds later on a bike and caught up to Meena in 36 seconds. What was Neha's speed?Solution
ATQ,
Distance covered by Meena in 6 seconds = 18 × 6 = 108 metres
Relative speed between Neha and Meena = 108 ÷ 36 = 3 m/s
Neha must be faster.
So, Neha’s speed = 18 + 3 = 21 m/s
- Suppose D, E and F can do a piece of work individually in 18, 27 and 36 days respectively. If they combine and work for 4 days, what percentage of work wou...
- A pipe can fill a tank in 20 hours, and B pipe can drain a tank in 15 hours. If a system of N pipes (fill pipes and drain pipes put together) can fill the ...
Rohit is five times as efficient as Sohan and twice as efficient as Mohan. If Sohan takes 15 days to finish some work, then find the time taken by Rohit...
In a factory, there are 3 machines. Machine A completes a task in 8 days, Machine B completes it in 12 days, and Machine C completes it in 15 days. If a...
- Together, Ali and Imran take 40 days to complete a project. After working jointly for 32 days, they left, and Zara completed the remaining work in 4 days. ...
‘A’ and ‘B’ together can complete a work in 8 days, while ‘B’ and ‘C’ together can complete the work in ...
25 men can complete a piece of work in 30 days. ‘x’ men started the work and after 24 days 60 more men joined them so that whole work was finished i...
A, B and C can complete a work in 10, 20 and 15 days respectively. A left the work 3 days before the work was completed and B left 1 days after A had le...
A work can be completed by ‘A’ and ‘B’, alone in 12 days and 18 days, respectively. Find the number of days taken by ‘C’ to complete the sam...
Relevant for Exams:
