What is the average speed of a car which covers half the distance with a speed of 28 km/h and the other half with a speed of 84 km/h?
A42km/h
B38km/h
C43km/h
D39km/h
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Related Questions:
A person travelled a distance of 60 km and then returned to the starting point. The time taken by him for the return journey was hour more than the time taken for the outward journey, and the speed during the return journey was 10 km/h less than that during the outward journey. His speed during the outward journey (in km/h) was:
Two trains of lengths 150m and 180m respectively are running in opposite directions on parallel tracks. If their speeds be 50 km/ hr and 58 km/hr respectively, in what time will they cross each other?
ഒരേ വേഗതയിൽ രണ്ട് ട്രെയിനുകൾ എതിർദിശയിൽ സഞ്ചരിക്കുന്നു. ഓരോ ട്രെയിനിന്റെയും നീളം 200 മീറ്ററാണെങ്കിൽ അവ 30 സെക്കൻഡിനുള്ളിൽ പരസ്പരം കടന്നുപോകുകയാണെങ്കിൽ, ഓരോ ട്രെയിനിന്റെയും വേഗത ?
How many seconds will a boy take to run one complete round around a square field of side 55 metres, if he runs at a speed of 18 km/h?
A train crosses a bridge which is 120 m long in 14 seconds and the same train crosses a static pole in 8 seconds. Find the length and the speed of the train.