The sinhagad express left pune at noon sharp.two hours later,the deccan express started from pune in the same direction.the deccan express overtook the sinhagad express at 8pm.find the average speed of 2 trains over this journey.if the sum of their average speeds is 70km/h
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Singhabad express takes time till 8 pm= 12 to 8 pm= 8 hr.
similarily deccan takes to overtake singhbad=2 to 8 pm=6 hr.
so the speed are in the ratio 3:4 hence it will be 30 and 40 km/hr respectively. since the sum is 70.
so average speed=total distance covered by both train/ total time
=(240+240)/(8+6)=34.28 km/hr. ans.
similarily deccan takes to overtake singhbad=2 to 8 pm=6 hr.
so the speed are in the ratio 3:4 hence it will be 30 and 40 km/hr respectively. since the sum is 70.
so average speed=total distance covered by both train/ total time
=(240+240)/(8+6)=34.28 km/hr. ans.
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