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Pipes and Cisterns: Fill, Drain and Net Rate Tricks for CSAT
Master Pipes and Cisterns for CSAT Paper II: net rate, the LCM method, closed-early and half-tank patterns, speed-ratio pipes, plus PYQs and practice sets.
The cities that planned their drains 4,000 years before modern plumbing
In 1921, a railway contractor's dig in Punjab unearthed a 4,500-year-old city with better drains than many modern towns. Inside the discovery, extent, and grid-planned genius of the Harappan world.