A train is 250 m long. If the train takes 50 second to cross a tree by the railway line, then the speed of the train on…

A man in a train notices that he can count 21 telephone posts in one minutes. If they are known to be 50 metres apart, t…

A 6 cm long cigarette burns up in 15 minutes if no puff is taken.For every puff, it burns three times as fast during th…

Two cars start simultaneously from cities A and B, towards B and A respectively, on the same route. Once the two cars re…

Ravi walks to and fro to a shopping mall. He spends 30 minutes shopping. If he walks at a speed of 10 km an hour, he ret…

A car travelling with $$\frac{5}{7}$$ of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of …

A bus covers three successive 3 km stretches at speed of 10 km/hr, 20 km/hr and 60 km/hr respectively. Its average speed…

A car travels the first one-third of a certain distance with a speed of 10 km/hr, the next one-third distance with a spe…