Logo
    Logo

    Subject

    Quantitative Aptitude

    Topic

    Speed & Distance

    A motorist travels to a place 150 km away at an average speed of 50 km and returns at 30 km per hour. What is his average speed for the whole journey in km per hour?

    ক)
    35
    খ)
    37
    গ)
    37.5
    ঘ)
    40

    Explanation

    We know that, Speed = Distance/Time taken Thus, Time taken = Distance/Speed While Travelling, Time taken = 150/50 = 3 hours While Returning, Time taken = 150/30 = 5 hours Total time taken during the journey = 3 + 5 hours = 8 hours And, Total distance covered during the journey = (150 + 150) km = 300 km Thus Speed = 300/8 = 37.5 km/h

    Related questions

    A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat (in still water) and the stream is:Speed of a boat in standing water is 9 kmph and the speed of the stream is 5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1/10 km and 9 km respectively. The time taken by slower train to cross the faster train in seconds is -A man can row three-quarters of a kilometre against the stream in 11×(1/4) minutes and down the stream in 7×(1/2) minutes. The speed (in km/hr) of the man in still water is:In a 300 m race A beats B by 5 metre or 6 seconds. B's time over the course is -A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water?A boat covers a certain distance downstream in 1 hour, while it comes back in 1x(1/2) hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?A man buys tk 20 shares paying 9% dividend.  The man wants to have an interest of 12% on his money. The market value of each share is-

    Find Tutors

    View all Tutors